Effect collision

Hey guys I have been messing around with a bomb that is in a bubble. When the bubble is popped the bomb explodes, yet I need other bubbles without bombs/ or bombs to pop when the particles collide with other bubbles.
I layered a few components for a bubble with a bomb in it. but I’m just not sure what I am missing here. The explosion itself is one that epic provided called Blueprint_Effect_Explosion for those who have also downloaded examples. I have my bubbles set up with a very simplistic blueprint to play an emitter when clicked by using the event clicked, yet I just can’t quite figure it out. Any one have a real simple way or advice to do this??

I’m thinking , You need set custom collision for your trigger, block all except pawn or other object types.