Hello ,
One way would be to use the Get Overlapping Actors Of Class node on the collision volume. Although, you shouldn’t have an issue if I’m understanding you correctly. If you’re setting the boolean to true that allows the player to start this sequence in OnBeginOverlap and not setting it to false, you should be able to without issue.
Are you setting the boolean to false after a set amount of time? If so, I’d suggest setting it to false when the OnEndOverlap event is triggered instead.
Hope this helps!