diff --git a/spec.bs b/spec.bs
index 0fca17be8..64a7bfa06 100644
--- a/spec.bs
+++ b/spec.bs
@@ -6705,14 +6705,16 @@ scoring signals requests=] |entriesToBatch|:
 To <dfn>batch and fetch trusted scoring signals</dfn> given a [=trusted scoring signals batcher=]
 |batcher|:
 
+1. [=Assert=] that these steps are running [=in parallel=].
 1. Until |batcher| is no longer needed:
   1. Wait until at least one of the following is true:
     * |batcher|'s [=trusted scoring signals batcher/request queue=] [=map/is not empty=].
     * |batcher|'s [=trusted scoring signals batcher/request map=] [=map/is not empty=] and some
       heuristically chosen amount of time has passed.
-  1. Atomically transfer all entries in |batcher|'s [=trusted scoring signals batcher/
-    request queue=] to |incomingRequests|, leaving |batcher|'s [=trusted scoring signals batcher/
-    request queue=] empty.
+  1. Atomically do:
+    1. Let |incomingRequests| be a [=list/clone=] of |batcher|'s [=trusted scoring signals batcher/
+      request queue=].
+    1. [=list/Empty=] |batcher|'s [=trusted scoring signals batcher/request queue=].
   1. [=list/For each=] |request| in |incomingRequests|:
     1. Let |key| be (|request|'s [=trusted scoring signals request/seller script fetcher=],
       |request|'s [=trusted scoring signals request/base url=], |request|'s [=trusted scoring