diff --git a/bfs_h3_side_panel.py b/bfs_h3_side_panel.py
index 0651f78..e2d0ee5 100644
--- a/bfs_h3_side_panel.py
+++ b/bfs_h3_side_panel.py
@@ -712,6 +712,8 @@ if _io is not None:
                         input=_io.Audio.Input("ref_video_audio", tooltip="Soundtrack of the same-numbered reference video"), prefix="ref_video_audio_", min=0, max=3)),
                     _io.Autogrow.Input("ref_audios", optional=True, template=_io.Autogrow.TemplatePrefix(
                         input=_io.Audio.Input("ref_audio", tooltip="<Audio n> reference"), prefix="ref_audio_", min=0, max=3)),
+                    _io.Combo.Input("source_blur", options=_blur_modes(), default="off", optional=True, tooltip=
+                        "Blur the source person in what the model sees (the panel / the guide), keeping the mouth sharp (SAM 3.1): it reads the pose, motion and lips but has no face to copy. The output is never blurred. Works with or instead of panel_static."),
                     _io.Combo.Input("panel_static", options=PANEL_STATIC, default="off", optional=True, tooltip=
                         "TSC's fix for swaps in the same world: cover the face (or the whole person) of the pinned clip in TV "
                         "static, every frame (SAM 3), so the generated half cannot copy it and takes the identity from the "
@@ -736,12 +738,13 @@ if _io is not None:
         def execute(cls, model, clip, vae, task, instruction, prompt, width, height, length, position, size, fit, gap,
                     panel_noise, hold, rope_mode, rope_gap, ref_image_size, steps, sampler_name, scheduler, seed,
                     decode_canvas, audio_vae=None, panel=None, guide=None, guide_frame_idx=0, ref_images=None,
-                    ref_videos=None, ref_video_audios=None, ref_audios=None, panel_static="off", setting=None, vlm=None,
+                    ref_videos=None, ref_video_audios=None, ref_audios=None, panel_static="off", setting=None, vlm=None, source_blur="off",
                     vlm_max_tokens=1024):
             if panel is None and guide is None:
                 raise ValueError("BFS H3 Duet needs a panel, a guide, or both")
             raw_panel = panel
-            panel = static_over_panel(panel, panel_static)
+            panel = static_over_panel(_blur(panel, source_blur, 1.0, "[BFS H3 Duet] panel"), panel_static)
+            guide = _blur(guide, source_blur, 1.0, "[BFS H3 Duet] guide")
             if length <= 0:
                 src = guide if guide is not None else panel
                 length = src.shape[0] if src.shape[0] >= 5 else 124
@@ -775,6 +778,24 @@ def _shot_loop():
 PANEL_STATIC = ["off", "face", "person"]
 
 
+def _blur_modes():
+    try:
+        from .bfs_source_blur import SOURCE_BLUR
+    except ImportError:
+        from bfs_source_blur import SOURCE_BLUR
+    return SOURCE_BLUR
+
+
+def _blur(frames, mode, strength=1.0, log=""):
+    if frames is None or not mode or mode == "off":
+        return frames
+    try:
+        from .bfs_source_blur import blur_source
+    except ImportError:
+        from bfs_source_blur import blur_source
+    return blur_source(frames, mode, float(strength), log)
+
+
 def _small(frames: torch.Tensor, side: int = 640) -> torch.Tensor:
     H, W = frames.shape[1:3]
     s = side / max(H, W)
@@ -887,6 +908,8 @@ if _io is not None:
                     _io.Image.Input("keep_video", optional=True, tooltip="The video kept outside the mask (default: the panel clip)."),
                     _io.Autogrow.Input("ref_images", optional=True, template=_io.Autogrow.TemplatePrefix(
                         input=_io.Image.Input("ref_image", tooltip="<Picture n>, in order"), prefix="ref_image_", min=0, max=9)),
+                    _io.Combo.Input("source_blur", options=_blur_modes(), default="off", optional=True, tooltip=
+                        "Blur the source person in what the model sees (the panel / the guide), keeping the mouth sharp (SAM 3.1): it reads the pose, motion and lips but has no face to copy. The output is never blurred. Works with or instead of panel_static."),
                     _io.Combo.Input("panel_static", options=PANEL_STATIC, default="off", optional=True, tooltip=
                         "TSC's fix for swaps in the same world: cover the face (or the whole person) of the pinned clip in TV "
                         "static, every frame (SAM 3), so the generated half cannot copy it and takes the identity from the "
@@ -904,11 +927,12 @@ if _io is not None:
         def execute(cls, clip, vae, panel, task, instruction, prompt, width, height, length, position, size, panel_noise,
                     rope_mode, fit, gap, hold, rope_gap, ref_image_size, vlm_max_tokens, vlm=None, model=None,
                     audio_vae=None, guide=None, ref_images=None, keep_mask=None, keep_video=None, panel_static="off",
-                    setting=None):
+                    setting=None, source_blur="off"):
             from comfy_extras.nodes_minimax_h3 import MiniMaxH3ReferenceToVideo
             refs = [v for v in (ref_images or {}).values() if v is not None]
             raw_panel = panel
-            panel = static_over_panel(panel, panel_static)
+            panel = static_over_panel(_blur(panel, source_blur, 1.0, "[BFS H3 Duet Conditioning] panel"), panel_static)
+            guide = _blur(guide, source_blur, 1.0, "[BFS H3 Duet Conditioning] guide")
             if length <= 0:
                 length = panel.shape[0] if panel.shape[0] >= 5 else 124
             text = _shot_loop().duet_prompt(vlm, prompt, raw_panel, refs, task, instruction, int(vlm_max_tokens),
@@ -971,7 +995,9 @@ class BFSShotH3Duet:
             },
             "optional": {"audio_vae": ("VAE",),
                          "rope_mode": (ROPE_MODES, {"default": "canvas", "advanced": True}),
-                         "rope_gap": ("FLOAT", {"default": 0.0, "min": 0.0, "max": 256.0, "step": 1.0, "advanced": True})},
+                         "rope_gap": ("FLOAT", {"default": 0.0, "min": 0.0, "max": 256.0, "step": 1.0, "advanced": True}),
+                         "source_blur": (_blur_modes(), {"default": "off", "tooltip": "Blur the source person in what the model sees (the panel / the guide), keeping the mouth sharp (SAM 3.1): it reads the pose, motion and lips but has no face to copy. The output is never blurred."}),
+                         "source_blur_strength": ("FLOAT", {"default": 1.0, "min": 0.1, "max": 1.0, "step": 0.05})},
         }
 
     RETURN_TYPES = ("IMAGE", "AUDIO", "IMAGE", "STRING", "STRING")
@@ -985,7 +1011,7 @@ class BFSShotH3Duet:
 
     def render(self, shot, model, clip, vae, mode, task, instruction, use_ref_2, position, size, fit, gap,
                panel_noise, ref_image_size, steps, sampler_name, scheduler, seed, decode_canvas, audio_vae=None,
-               rope_mode="canvas", rope_gap=0.0):
+               rope_mode="canvas", rope_gap=0.0, source_blur="off", source_blur_strength=1.0):
         imgs = {}
         if shot.get("ref") is not None:
             imgs["ref_image_1"] = shot["ref"]
@@ -1001,9 +1027,11 @@ class BFSShotH3Duet:
             imgs[f"ref_image_{len(imgs) + 1}"] = prev
         text = _resolve_prompt(shot.get("prompt", ""), task, instruction, len(imgs), 0)
         hist, hsrc = shot_history(shot) if shot_history else (None, None)
+        seen = _blur(shot["frames"], source_blur, source_blur_strength,
+                     f"[BFS Shot H3 Duet] shot {int(shot.get('index', 0)) + 1}")
         out = h3_render(model, clip, vae, audio_vae, text, {"ref_images": imgs}, shot["width"], shot["height"],
                         shot["gen_length"], steps, sampler_name, scheduler, seed + int(shot.get("index", 0)),
-                        panel=shot["frames"] if duet else None, guide=shot["frames"] if guided else None,
+                        panel=seen if duet else None, guide=seen if guided else None,
                         position=position, size=size, fit=fit, gap=gap, panel_noise=panel_noise,
                         ref_image_size=ref_image_size, decode_canvas=decode_canvas,
                         rope_mode=rope_mode, rope_gap=rope_gap,
diff --git a/bfs_shot_loop.py b/bfs_shot_loop.py
index 24d7b3a..c4b4045 100644
--- a/bfs_shot_loop.py
+++ b/bfs_shot_loop.py
@@ -1957,6 +1957,10 @@ def duet_prompt(vlm, prompt: str, frames: torch.Tensor | None, refs: list, task:
 # ---------------------------------------------------------------------------- continuity between shots
 
 CHAIN_MODES = ("off", "reference", "first frame", "history")
+try:
+    from .bfs_source_blur import SOURCE_BLUR, blur_source
+except ImportError:
+    from bfs_source_blur import SOURCE_BLUR, blur_source
 _LAST_RESULT: dict[str, Any] = {}   # auto loop: the last shot a render node produced (index, count, frames)
 
 
@@ -2807,6 +2811,13 @@ class BFSShotH3Conditioning:
                     "video': enters as a native reference video (<Video n>, after the shot's own if guide_mode uses "
                     "it). The LoRAs were trained with one full guide, so test against off; it can also pull the old "
                     "subject's look."}),
+                "source_blur": (SOURCE_BLUR, {"default": "off", "tooltip":
+                    "Blur the source person in what the model SEES of the source (aligned guide, native reference "
+                    "video, duet panel), keeping the mouth sharp (SAM 3.1 masks). The model still reads the pose, "
+                    "motion and lips but has no face to copy, so the identity comes from the reference. The kept "
+                    "area of 'Mask only' and the output are never blurred. JalenBrunson's swap trick."}),
+                "source_blur_strength": ("FLOAT", {"default": 1.0, "min": 0.1, "max": 1.0, "step": 0.05,
+                    "tooltip": "How coarse the source blur is (1 = no detail left)."}),
                 "mask_guide_look": (MASK_GUIDE_LOOKS, {"default": MASK_GUIDE_LOOKS[0], "tooltip":
                     "What the mask guide shows of the subject. grey blurred: its volume, light and head direction "
                     "without colours or a face (default). colour: as it is (can make the model copy the old subject). "
@@ -2831,7 +2842,8 @@ class BFSShotH3Conditioning:
     def condition(self, shot, clip, vae, guide_mode, use_ref_2, first_frame, ref_image_size,
                   audio_vae=None, with_audio=False, duet="off", model=None, panel_position="left", panel_size=1.0,
                   panel_noise=0.0, rope_gap=0.0, task="planner prompt", instruction="", vlm=None,
-                  setting_ref="off", setting_mask=None, inpaint="off", mask_guide="off", mask_ref_size="1/2", mask_guide_look="grey blurred"):
+                  setting_ref="off", setting_mask=None, inpaint="off", mask_guide="off", mask_ref_size="1/2", mask_guide_look="grey blurred",
+                  source_blur="off", source_blur_strength=1.0):
         from comfy_extras.nodes_minimax_h3 import MiniMaxH3AddGuide, MiniMaxH3ReferenceToVideo
         try:
             from .bfs_h3_side_panel import build_prompt, fill_layout, make_info
@@ -2888,6 +2900,9 @@ class BFSShotH3Conditioning:
                       audio_vae=audio_vae, ref_images=refs or None)
         use_mask = inpaint == "only the mask" or (inpaint == INPAINT_MODES[0] and shot.get("inpaint"))
         gtag = f"[BFS Shot H3 Conditioning] shot {shot.get('index', 0) + 1}/{shot.get('count', 1)}"
+        # what the model sees of the source; the kept area (keep_video) stays the original
+        seen = blur_source(shot["frames"], source_blur, float(source_blur_strength), gtag) \
+            if source_blur and source_blur != "off" else shot["frames"]
         pg = mask_guide if mask_guide in MASK_GUIDES[1:] else None
         if pg and (not use_mask or shot.get("crop") or on_canvas):
             print(f"{gtag}: mask_guide ignored: it is for 'Mask only' shots (mask, no crop, no duet)", flush=True)
@@ -2900,7 +2915,7 @@ class BFSShotH3Conditioning:
         if native or pg == MASK_GUIDES[3]:
             vids = {}
             if native:
-                vids["ref_video_1"] = shot["frames"]
+                vids["ref_video_1"] = seen
                 if audio is not None:
                     kwargs["ref_video_audios"] = {"ref_video_audio_1": audio}
             if pg == MASK_GUIDES[3]:
@@ -2926,10 +2941,10 @@ class BFSShotH3Conditioning:
         if aligned and (not on_canvas or audio is not None):
             positive = MiniMaxH3AddGuide.execute(positive=positive, latent=latent, frame_idx=0, vae=vae,
                                                  audio_vae=audio_vae if audio is not None else None,
-                                                 image=shot["frames"], audio=audio).args[0]
+                                                 image=seen, audio=audio).args[0]
         if first_frame != "none":
             positive = MiniMaxH3AddGuide.execute(positive=positive, latent=latent, frame_idx=0, vae=vae,
-                                                 image=shot["frames"][:1]).args[0]
+                                                 image=seen[:1]).args[0]
         prev = chain_image(shot)
         if prev is not None and shot.get("chain") == "first frame":
             positive = MiniMaxH3AddGuide.execute(positive=positive, latent=latent, frame_idx=0, vae=vae,
@@ -2957,9 +2972,9 @@ class BFSShotH3Conditioning:
             except ImportError:
                 from bfs_h3_side_panel import BFSH3SidePanel, patch_model_rope
             # the guide goes straight onto the canvas (guides added above are moved onto it by the panel step)
-            guide = shot["frames"] if aligned and audio is None else None
+            guide = seen if aligned and audio is None else None
             positive, latent, info, _, _ = BFSH3SidePanel().apply(
-                positive, latent, vae, shot["frames"], panel_position, panel_size, "contain", 0, "all frames",
+                positive, latent, vae, seen, panel_position, panel_size, "contain", 0, "all frames",
                 panel_noise, guide, 0, keep_video=keep_video, keep_mask=keep_mask)
             shot["panel"] = info        # BFS Shot Join crops the decoded canvas back to the video
             if duet == "shifted RoPE":
diff --git a/bfs_source_blur.py b/bfs_source_blur.py
new file mode 100644
index 0000000..cce1561
--- /dev/null
+++ b/bfs_source_blur.py
@@ -0,0 +1,86 @@
+"""Optional blur of the source person in what the model SEES of the source (aligned guide, native reference video,
+duet panel), keeping the mouth sharp: the model still reads the pose, the motion and the lips, but has no face to copy,
+so the identity comes from the reference. JalenBrunson's trick for reliable ref2v swaps (Sapiens2 there); here the
+masks come from SAM 3.1, already used by the planner. The kept area (inpaint) and the output are never blurred.
+"""
+from __future__ import annotations
+
+import torch
+
+SOURCE_BLUR = ["off", "face (keep mouth)", "head + hands (keep mouth)", "person (keep mouth)"]
+_PARTS = {SOURCE_BLUR[1]: ("face",), SOURCE_BLUR[2]: ("head", "hand"), SOURCE_BLUR[3]: ("person",)}
+_CACHE: dict = {}
+
+
+def _sl():
+    try:
+        from . import bfs_shot_loop as SL
+    except ImportError:
+        import bfs_shot_loop as SL
+    return SL
+
+
+def _small(frames: torch.Tensor, side: int = 640) -> torch.Tensor:
+    H, W = frames.shape[1:3]
+    s = side / max(H, W)
+    x = frames[..., :3].float()
+    if s >= 1:
+        return x
+    return torch.nn.functional.interpolate(x.movedim(-1, 1), size=(max(32, int(H * s) // 2 * 2), max(32, int(W * s) // 2 * 2)),
+                                           mode="bilinear", align_corners=False).movedim(1, -1)
+
+
+def _grow(m: torch.Tensor, px: int) -> torch.Tensor:
+    if px <= 0:
+        return m
+    return torch.nn.functional.max_pool2d(m[:, None], 2 * px + 1, stride=1, padding=px)[:, 0]
+
+
+def blur_mask(frames: torch.Tensor, mode: str, log: str = "") -> torch.Tensor | None:
+    """[N,h,w] float mask (working size) of what to blur: the parts for `mode` minus the (slightly grown) mouth."""
+    parts = _PARTS.get(mode)
+    if not parts:
+        return None
+    SL = _sl()
+    small = _small(frames)
+    key = (mode, tuple(small.shape), SL._image_key(frames[:1]), SL._image_key(frames[-1:]),
+           SL._image_key(frames[frames.shape[0] // 2:frames.shape[0] // 2 + 1]))
+    if key in _CACHE:
+        return _CACHE[key]
+    m = torch.zeros(small.shape[:3])
+    for p in parts:
+        m = torch.maximum(m, (SL.segment_frames(small, dict(SL.DEFAULT_MASK, text=p, max_objects=8, threshold=0.4)) > 0.5).float())
+    mouth = (SL.segment_frames(small, dict(SL.DEFAULT_MASK, text="mouth", max_objects=8, threshold=0.3)) > 0.5).float()
+    keep = _grow(mouth, max(1, int(min(small.shape[1:3]) * 0.012)))
+    out = (_grow(m, max(1, int(min(small.shape[1:3]) * 0.015))) * (1 - keep)).clamp(0, 1)
+    if log:
+        print(f"{log}: source blur '{mode}': {float(m.mean()) * 100:.1f}% of the frame, mouth kept "
+              f"({'found' if float(mouth.sum()) > 0 else 'not found: the whole part is blurred'})", flush=True)
+    if len(_CACHE) > 8:
+        _CACHE.pop(next(iter(_CACHE)))
+    _CACHE[key] = out
+    return out
+
+
+def blur_source(frames: torch.Tensor | None, mode: str, strength: float = 1.0, log: str = "") -> torch.Tensor | None:
+    """The frames with the source person blurred per `mode` (mouth kept). `strength` 0-1 sets how coarse the blur is."""
+    if frames is None or not mode or mode == "off" or strength <= 0:
+        return frames
+    m = blur_mask(frames, mode, log)
+    if m is None or float(m.sum()) == 0:
+        return frames
+    x = frames[..., :3].float()
+    N, H, W = x.shape[:3]
+    # a heavy blur: down to ~1/12-1/40 of the size and back, then a soft pass; blocky detail never survives it
+    f = max(4, int(min(H, W) * (0.025 + 0.06 * float(strength))))
+    low = torch.nn.functional.interpolate(x.movedim(-1, 1), size=(max(2, H // f), max(2, W // f)), mode="area")
+    blur = torch.nn.functional.interpolate(low, size=(H, W), mode="bilinear", align_corners=False)
+    blur = torch.nn.functional.avg_pool2d(blur, 5, stride=1, padding=2).movedim(1, -1)
+    mm = torch.nn.functional.interpolate(m[:, None], size=(H, W), mode="bilinear", align_corners=False)
+    mm = torch.nn.functional.avg_pool2d(mm, 9, stride=1, padding=4)[:, 0, ..., None].clamp(0, 1)
+    if mm.shape[0] != N:   # one mask per frame; a shorter list holds its last one
+        idx = [min(i, mm.shape[0] - 1) for i in range(N)]
+        mm = mm[idx]
+    out = x * (1 - mm) + blur * mm
+    del low, blur, mm
+    return out
diff --git a/pyproject.toml b/pyproject.toml
index 3a46343..70f9f62 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 name = "bfsnodes"
 description = "Custom ComfyUI nodes for reference-guided video: BFS Sampler (guide-driven IC-LoRAs, auto crop, mask inpainting, temporal chunking), LTX Multiple Controls / Identity Transfer / Edit Anything, Head-Swap and Anime2Real conditioning, MiniMax-H3 latent guides, RoPE layouts and loaders, LoRA Surgery, and Shot Planner / Shot Loop (tabbed panel): split long videos into shots at camera cuts, face-tracked cast, SAM 3 mask per shot with four generation modes (full frame, mask only, crop, crop + mask), optional Qwen3-VL to suggest settings, describe references ({details}) and the person to replace ({target}), continuity between shots, H3 conditioning with an optional duet and prompt writer, join with the original timing, audio and a side-by-side comparison. H3 Duet: pin a source clip beside the video, training-free."
-version = "1.90.0"
+version = "1.91.0"
 license = {file = "LICENSE"}
 dependencies = [
     "torch",
diff --git a/web/js/docs/BFSShotPlanner.md b/web/js/docs/BFSShotPlanner.md
index 34b5c02..6f2988b 100644
--- a/web/js/docs/BFSShotPlanner.md
+++ b/web/js/docs/BFSShotPlanner.md
@@ -283,6 +283,16 @@ Every setting in the panel has a hover tooltip (ⓘ). The main ones:
 | Mask: threshold / max objects / paste back | SAM 3 text matching, objects tracked, paste only the mask or the whole box |
 | VLM: frames per shot / max tokens | how much the VLM sees and how long it may answer |
 
+## Source blur (keep the mouth) (1.91.0)
+
+`source_blur` on **BFS Shot H3 Conditioning**, **BFS Shot H3 Duet**, **BFS H3 Duet** and **BFS H3 Duet Conditioning**
+blurs the source person in what the model *sees* of the source (aligned guide, native reference video, duet panel),
+keeping the **mouth** sharp: the model still reads the pose, the motion and the lips but has no face to copy, so the
+identity comes from the reference. Masks from SAM 3.1 (the part, minus a slightly grown "mouth" mask), cached per shot.
+`face (keep mouth)`, `head + hands (keep mouth)` (also hides hair and hands), `person (keep mouth)` (the whole body:
+only for big changes, the pose then comes from the blurred shape). The kept area of *Mask only* and the output are
+never blurred. Trick shared by JalenBrunson (Sapiens2 there) for reliable ref2v swaps.
+
 ## Big videos (upload)
 
 ComfyUI refuses any single request bigger than `--max-upload-size` (100 MB by default), which is why big videos fail