diff --git a/docs/defect-shapes-773.md b/docs/defect-shapes-773.md
index 5e97d0045..c74748f89 100644
--- a/docs/defect-shapes-773.md
+++ b/docs/defect-shapes-773.md
@@ -5,7 +5,9 @@ each class, and an audit of the tooling already configured in this repo. This is
 artifact**, not a rulebook: the rules it argues for land as decision records and follow-up issues,
 which are linked per class below.
 
-Measured 2026-08-13 against the tracker as of issue #773 and `origin/main` at `f9f8f65ce`.
+Measured 2026-08-13 against `origin/main` at `f9f8f65ce`. **The issue corpus is a snapshot drawn at
+19:45 that day** — a boundary that matters, because #767 closed nineteen minutes later and is
+therefore absent from every count here (§3.7).
 
 ---
 
@@ -274,10 +276,19 @@ the text under review.
 
 - The ≥3-rounds count comes from pattern-matching narrative prose, not from a structured field. It
   under-counts records that ran rounds without narrating them, so 18 is a floor.
-- **#767 — the eight-round case that motivates #773 — is not in this corpus at all.** It was still
-  open when the corpus was drawn, so it has no `## Closing record`. The headline example of the
-  phenomenon is invisible to the measurement characterising it, which is worth stating plainly rather
-  than letting the 18 stand as though it covered the worst case.
+- **#767 — the case #773 describes as taking eight review rounds — is excluded by snapshot timing,
+  not by absence.** The corpus was drawn at 19:45 on 2026-08-13; #767 closed at 20:04, nineteen
+  minutes later, and now carries a full `## Closing record`. So the worst instance of the phenomenon
+  is missing from every count in this document, including the 18 above. It is named here rather than
+  quietly folded in, because re-drawing the corpus would move every denominator in §2 and §3.6 and
+  the snapshot boundary has to sit somewhere.
+
+  Reading its record changes nothing structurally and confirms Family A twice over — it reinvents
+  detector A independently, for the fifth and sixth times in this repo: *"Refuting two variants of a
+  channel is not clearing the channel"* (the working attacks through that channel were never tried),
+  and *"Enumerating **shapes** of a command loses. Nine disarms across two rounds; running the
+  command settles them together."* That last sentence is detector A in one line — stop sampling the
+  shapes you thought of, execute the population.
 
 ---