Hit Results Under Cursor

Hello all,
I am currently working on a top down project and all i want to do is set my target pawn if my cursor is over that actor and display a decal. Now i can get it to set the target and the decal but i would like it if i remove my cursor off the ai character the decal would go back to being invisible but i can not seem to get it to work i have attached a pic if some one could point me in the right direction that would be great cheers