diff --git a/src/AcDream.App/Physics/LiveEntityNetworkUpdateController.cs b/src/AcDream.App/Physics/LiveEntityNetworkUpdateController.cs
index 051fe677..63c36e64 100644
--- a/src/AcDream.App/Physics/LiveEntityNetworkUpdateController.cs
+++ b/src/AcDream.App/Physics/LiveEntityNetworkUpdateController.cs
@@ -2417,11 +2417,21 @@ internal sealed class LiveEntityNetworkUpdateController
                     update.Position.LandblockId);
             }
 
-            // PositionPack::UnPack initializes an absent velocity to zero;
-            // MoveOrTeleport installs that exact vector with set_velocity.
-            // The canonical seam wakes the retained ObjectClock and body in
-            // one operation. Position-delta velocity below remains animation
-            // diagnostics and is never substituted into physics.
+            // 4a-family correction (2026-08-04, found and reported while
+            // pinning C4 route 5's D-P5 no-velocity design): the previous
+            // comment here claimed "MoveOrTeleport installs that exact vector
+            // with set_velocity". A byte-level disassembly of the PDB-paired
+            // binary (0x00516330-0x00516438, every branch) shows
+            // MoveOrTeleport never reads its velocity argument's stack slot,
+            // and UnpackPositionEvent performs no set_velocity either — the
+            // only set_velocity in the whole accepted-Position chain zeroes
+            // the LOCAL player (@0x004541B4). This call's actual retail
+            // justification is therefore NOT yet established and needs its
+            // own audit; what IS still true and unaffected by that finding:
+            // the canonical seam below wakes the retained ObjectClock and
+            // body in one operation, and the Position-delta velocity further
+            // down remains animation diagnostics, never substituted into
+            // physics.
             if (!_liveEntities.IsCurrentPositionAuthority(
                     positionRecord,
                     acceptedPositionAuthorityVersion))