diff --git a/authored/rendering.json b/authored/rendering.json
index a8f03a9d..fb4c2a34 100644
--- a/authored/rendering.json
+++ b/authored/rendering.json
@@ -171,30 +171,37 @@
   ],
   "leaf_clock": {
     "title": {
-      "start_units": null,
-      "rate": null
+      "start_units": 40.0,
+      "rate": 0.514
     }
   },
   "leaf_clock_why": [
-    "The leaf's clock relative to its screen's, as an origin and a rate.",
+    "The leaf's clock relative to its screen's: leaf_t = rate * (screen_t - start_units).",
     "",
-    "\ud83d\udd34 BOTH null ON PURPOSE. null means the leaf runs on the screen clock --",
-    "which is what the port has always done, and which is ITSELF an unmeasured",
-    "assumption (offset 0, rate 1) that the Decoder's capture contradicts.",
+    "MEASURED off one draw capture by the Decoder, docs/re/f6-unit8-leaf-clock-in-title-units.md",
+    "on origin/auto/frame-blend-draw-path. Both numbers come from the SAME capture,",
+    "so neither crosses runs.",
     "",
-    "F6: a human reports the title's light sweep starts earlier in the port than",
-    "in the game, and separately that the port may be running it FASTER --",
-    "flagged by them as an impression, not a judgement to lean on. The capture",
-    "points the same way from a different direction: the game's leaf t=0 is its",
-    "first drawn frame, 40 frames after the title's first element, and its rate",
-    "measures well below the title's.",
+    "  start_units 40  -- the game's leaf t=0 is its first drawn frame, 40 frames",
+    "                     after the title's first element draws. The title rate is",
+    "                     itself measured, not assumed: ptcopyright declares a",
+    "                     0->255 ramp over 22 units and rises across 22 frames, so",
+    "                     the title runs 1.000 units/frame and frames and units are",
+    "                     interchangeable there.",
+    "  rate 0.514      -- 600 leaf units across 1168 frames, anchored on the LOOP",
+    "                     WRAP rather than on where motion stops. Within 3% of 1/2.",
     "",
-    "\u26a0\ufe0f NOT FILLED IN WITH AN ESTIMATE. F1 established the rule the hard way: an",
-    "invented constant here is indistinguishable from a measured one later. The",
-    "figures come from the Decoder expressed in TITLE units, with the title's own",
-    "rate stated rather than assumed -- their unit 4 flags that rate as an",
-    "assumption, and it is load-bearing for both numbers.",
+    "This SUPERSEDES their earlier 0.463, which divided by the end of MOTION; the",
+    "declared track is stationary from t=540 to t=600, so that denominator was short.",
     "",
-    "To adopt: set start_units and rate. Nothing else changes."
+    "CORROBORATION from a second, independent direction: the human, watching both,",
+    "reported the port looks FASTER than the game -- offered as an impression, not a",
+    "judgement to lean on. A 1.0x port against a 0.514x game is exactly twice too",
+    "fast, which is the direction and roughly the size they describe.",
+    "",
+    "RESIDUAL RISK, stated: the rate rests on a SINGLE wrap in a single capture.",
+    "A wrap-to-wrap period would harden it. Adopted anyway because the port's",
+    "current value is not a measurement at all -- it is the unexamined assumption",
+    "that the leaf shares the screen's clock, which this refutes."
   ]
 }
diff --git a/port/scripts/screen_view.gd b/port/scripts/screen_view.gd
index cb48f97f..7839e017 100644
--- a/port/scripts/screen_view.gd
+++ b/port/scripts/screen_view.gd
@@ -897,7 +897,19 @@ func _draw() -> void:
 		var pose: Dictionary = element.get("rest", {}) if pose_mode == Pose.REST \
 			else pose_at(element, time_units)
 		var colour := modulate_of(pose)
-		if colour.a <= 0.0:
+		# 🔴 A LEAF OUTLIVES ITS PARENT, AND SKIPPING HERE KILLED IT EARLY.
+		#
+		# The parent's pose gates the whole element, so `ptloop01` expiring at
+		# t=250 stopped the sweep being drawn at all -- while this file's own
+		# decode says the leaf runs on its OWN timeline and the parent's alpha is
+		# not multiplied in. The two were inconsistent and the gate won silently.
+		#
+		# The capture settles it: the game submits the sweep across frames
+		# 746..1913 while the parent expires at frame 956, so it keeps drawing for
+		# roughly 950 frames after the parent is gone
+		# (`f6-unit3-sweep-track-fits.md`, `f6-unit8-leaf-clock-in-title-units.md`).
+		# A transparent parent is not evidence that its leaf is transparent.
+		if colour.a <= 0.0 and not draw_leaf_for.has(id):
 			# 🔴 THIS LINE USED TO SAY "at rest" WHATEVER INSTANT IT HAD POSED.
 			#
 			# On the timeline path the pose is `pose_at(time_units)`, not