diff --git a/.github/workflows/pr-base-repoint.yml b/.github/workflows/pr-base-repoint.yml
index 5e882c3d..7bb67ac7 100644
--- a/.github/workflows/pr-base-repoint.yml
+++ b/.github/workflows/pr-base-repoint.yml
@@ -35,8 +35,19 @@ permissions:
 
 # One re-trigger in flight per PR. A second base re-point supersedes the first;
 # the older dispatch is answering a question about a base that no longer holds.
+#
+# The group is partitioned by event class because a body edit arrives ~2s after
+# a base re-point on the same PR: sharing one group, it cancelled the re-point
+# run before its dispatch step and then skipped itself, so no guard run ever
+# reached a verdict. The guard is advisory — `rollup` is the only required
+# context — so its red is an operator signal, not a merge gate.
+#
+# The key mirrors only the `changes.base` half of the job's `if:`, not the
+# same-repo conjunct. Safe because a PR's head repo is fixed at creation: a
+# fork PR's runs only ever share a group with other fork runs of the same PR,
+# and every one of those skips.
 concurrency:
-  group: pr-base-repoint-${{ github.event.pull_request.number }}
+  group: pr-base-repoint-${{ github.event.pull_request.number }}-${{ github.event.changes.base != null && 'repoint' || 'edit' }}
   cancel-in-progress: true
 
 jobs: