Cant cast actor causing radial damage.

Hi ! Just stuck on weird thing. i’m trying to make cast to grenade/explosives (for specific damage to some actors on scene) causing radial damage but cant do this. Event any damage does damage but cast always fail. I think this is because such type of objects do not hit the actor directly, but projectils pass the cast just fine. Is there any way to cast any object by radial damage only, not hit?