diff --git a/src/AcDream.Core/Physics/PhysicsBody.cs b/src/AcDream.Core/Physics/PhysicsBody.cs
index 2c2b20a..753db36 100644
--- a/src/AcDream.Core/Physics/PhysicsBody.cs
+++ b/src/AcDream.Core/Physics/PhysicsBody.cs
@@ -280,6 +280,16 @@ public sealed class PhysicsBody
     ///
     /// Cross-checked with ACE PhysicsObj.calc_friction which uses 0.25f as
     /// the threshold instead; the decompile uses 0.0.  We match the decompile.
+    ///
+    /// L.3c attempt (2026-04-30, REVERTED): tried bumping to 0.25f per
+    /// retail acclient_2013_pseudo_c.txt:276705. Build green but
+    /// PlayerMovementControllerTests showed forward locomotion dropping
+    /// from ~3m/s to ~0.16m/s — friction now hammers normal walking.
+    /// Retail's friction block is gated by an additional state check at
+    /// line 276702 (`(this->state & ...) == 0`) that we didn't decode
+    /// fully; locomotion is probably skipped from the friction path
+    /// while actively walking. Filed as L.3c-followup; keeping the
+    /// matching-the-decompile-as-read 0.0 threshold for now.
     /// </summary>
     public void calc_friction(float dt, float velocityMag2)
     {