how to check overlapped actor without casting?

Hey there i got simple quiestion. How to check overlapped actour without Casting it, i heard that Casting takes a lot of resourses .
Here is on the image i tried to cast when character overlapping and check without casting when character Ends overlapp .
And guess what ? Casting version worked but , the one without casting didn’t . Can you explain why ? and is there a way to do it without casting?