diff --git a/pkg/scheduler/framework/plugins/defaultpreemption/default_preemption.go b/pkg/scheduler/framework/plugins/defaultpreemption/default_preemption.go
index 71e53f52009..c9144cb175e 100644
--- a/pkg/scheduler/framework/plugins/defaultpreemption/default_preemption.go
+++ b/pkg/scheduler/framework/plugins/defaultpreemption/default_preemption.go
@@ -116,13 +116,9 @@ func (pl *DefaultPreemption) PreEnqueue(ctx context.Context, p *v1.Pod) *framewo
 // EventsToRegister returns the possible events that may make a Pod
 // failed by this plugin schedulable.
 func (pl *DefaultPreemption) EventsToRegister(_ context.Context) ([]framework.ClusterEventWithHint, error) {
-	return []framework.ClusterEventWithHint{
-		// We don't need any QHint for the event
-		// because the Pod rejected by the preemption plugin is the one that is running the preemption,
-		// and the Pod won't be requeued until all the preemption API calls are completed
-		// (we block the Pod from being requeued at PreEnqueue).
-		{Event: framework.ClusterEvent{Resource: framework.Pod, ActionType: framework.Delete}},
-	}, nil
+	// The plugin moves the preemptor Pod to acviteQ/backoffQ once the preemption API calls are all done,
+	// and we don't need to move the Pod with any events.
+	return nil, nil
 }
 
 // calculateNumCandidates returns the number of candidates the FindCandidates
diff --git a/pkg/scheduler/framework/preemption/preemption.go b/pkg/scheduler/framework/preemption/preemption.go
index 3f478c75d2a..924898b3fe4 100644
--- a/pkg/scheduler/framework/preemption/preemption.go
+++ b/pkg/scheduler/framework/preemption/preemption.go
@@ -209,8 +209,7 @@ func (ev *Evaluator) IsPodRunningPreemption(podUID types.UID) bool {
 	ev.mu.RLock()
 	defer ev.mu.RUnlock()
 
-	_, ok := ev.preempting[podUID]
-	return ok
+	return ev.preempting.Has(podUID)
 }
 
 // Preempt returns a PostFilterResult carrying suggested nominatedNodeName, along with a Status.
@@ -483,7 +482,7 @@ func (ev *Evaluator) prepareCandidateAsync(c Candidate, pod *v1.Pod, pluginName
 	}
 
 	ev.mu.Lock()
-	ev.preempting[pod.UID] = struct{}{}
+	ev.preempting.Insert(pod.UID)
 	ev.mu.Unlock()
 
 	logger := klog.FromContext(ctx)
@@ -494,7 +493,7 @@ func (ev *Evaluator) prepareCandidateAsync(c Candidate, pod *v1.Pod, pluginName
 		defer metrics.PreemptionGoroutinesExecutionTotal.WithLabelValues(result).Inc()
 		defer func() {
 			ev.mu.Lock()
-			delete(ev.preempting, pod.UID)
+			ev.preempting.Delete(pod.UID)
 			ev.mu.Unlock()
 			ev.Handler.Activate(logger, map[string]*v1.Pod{pod.Name: pod})
 		}()