diff --git a/scripts/matches/killall.sh b/scripts/matches/killall.sh
index b3c0876..efb7327 100755
--- a/scripts/matches/killall.sh
+++ b/scripts/matches/killall.sh
@@ -15,13 +15,17 @@ CLUSTER="$(tofu -chdir="$ENV_DIR" output -raw match_cluster_name)"
 INSTANCE="$(tofu -chdir="$ENV_DIR" output -raw api_instance_id)"
 
 tasks="$(aws ecs list-tasks --cluster "$CLUSTER" --query 'taskArns[]' --output text | xargs)"
+failed=0
 if [ -z "$tasks" ]; then
   echo "no running match tasks"
 else
   for task in $tasks; do
     aws ecs stop-task --cluster "$CLUSTER" --task "$task" \
-      --reason "killall: operator stop" --query 'task.taskArn' --output text
+      --reason "killall: operator stop" --query 'task.taskArn' --output text \
+      || { echo "WARN: failed to stop task $task" >&2; failed=$((failed + 1)); }
   done
+  [ "$failed" -eq 0 ] \
+    || echo "WARN: failed to stop $failed of $(wc -w <<<"$tasks") task(s); the rest were stopped" >&2
 fi
 
 # AWS-StartNonInteractiveCommand rather than send-command's AWS-RunShellScript.
@@ -43,3 +47,5 @@ parameters="$(jq -n --arg command "$remote" '{command: [$command]}')"
 aws ssm start-session --target "$INSTANCE" \
   --document-name AWS-StartNonInteractiveCommand \
   --parameters "$parameters"
+
+[ "$failed" -eq 0 ]