diff --git a/SKILL.md b/SKILL.md
index dfeb171..f56a6e2 100644
--- a/SKILL.md
+++ b/SKILL.md
@@ -410,6 +410,11 @@ and reconciles the target doc with the Body.
   checkout, such as Soul's clone or a parallel Hands worktree, gets its own
   target subdirectory. The mutation harness is immune because it bumps the time
   on every file it writes. A plain test run is not.
+- **Kill processes by the PID you started, never by image name.** A Hands pass
+  cleared its CPU burners with `taskkill /IM node.exe /T`. That killed every
+  Node process on the shared workstation, including other agents' and the
+  operator's. Record the PID of every process you launch, and stop only those
+  PIDs.
 - **Write commit messages with the Write tool to a uniquely named scratch file,
   then `git commit -F`.** PowerShell 5 here-strings break `-m` quoting, and its
   `Out-File`/`Set-Content` write a BOM into message files.
diff --git a/references/changelog.md b/references/changelog.md
index 5d52950..addc724 100644
--- a/references/changelog.md
+++ b/references/changelog.md
@@ -2,6 +2,14 @@
 
 Record each change to the skill together with the evidence that motivated it.
 
+## 2026-09-22: a cleanup by image name killed the whole machine's Node
+
+Evidence: during the QUIC seventh fix batch's Windows stress round, Hands
+cleared its busy-loop burners with `taskkill //IM node.exe //T`. That kills
+every `node.exe` on the host, and the workstation is shared by several agents
+and the operator. The kill can't be undone, and nothing records what it took
+down. Rule added to SKILL.md's tooling list: kill by the PID you started.
+
 ## 2026-09-22: seven passes on one line, because the observation was outside
 
 Evidence: the QUIC bridge's rule "the wait is the timeout the host asked for".