diff --git a/docs/re/METHOD.md b/docs/re/METHOD.md
index 5c0752e3..0ea0ea1d 100644
--- a/docs/re/METHOD.md
+++ b/docs/re/METHOD.md
@@ -2912,3 +2912,34 @@ just their content.** A checker with a green light over a stale corpus is report
 on a snapshot, and nothing in its output says so unless it is made to. Ask of any
 scan not only *what did it look at* but *how old was what it looked at, and who
 owns it*.
+
+## A cross-agent register can flag a phrase that is live and correct in the other corpus
+
+Measured, not feared. `sylpheed-port`'s register holds **"1 of 3 streams"** as a
+**dead** claim. The same words appear twice in this corpus — `HANDOFF.md:1635` and
+`voice-three-streams-are-concurrent.md:72` — both reading *"the '1 of 3 streams'
+warning **stands**"*. It is **live and correct here**.
+
+⚠️ It is not a revival and not a hygiene failure. **Two corpora used the same words
+for different propositions**, and no amount of care on either side prevents that. I
+cannot tell from the bare phrase whether their dead claim is even the same
+proposition as my live warning, and guessing would be the method-versus-subject
+error in a new costume.
+
+📌 **So a cross-agent check must be advisory, and the reason is sharper than
+"noise gets skimmed."** A false positive aimed at another agent does not get
+ignored — **it gets disputed**, and the dispute costs more than the check was worth.
+Their first version counted six hits in my files as failures, applying their
+`[refuted]` token to a corpus that marks corrections its own way; I would have
+argued with it rather than fixing my pages, which is the worst of both outcomes.
+
+## Relaying a peer's dead claims creates occurrences of them — measured
+
+Their observation, and this corpus supplies the measurement: of **11** occurrences
+of their registered claims in my files, **3 are in the single file I wrote to
+report on their claims**. I produced the effect while documenting it.
+
+📌 The cost is **per-mention**, and it now travels **between** agents rather than
+accumulating inside one. Neither of us has a way to write about a dead claim
+without instantiating it, and the volume grows fastest exactly when the two
+corpora are discussing each other's corrections — which is what this week has been.