Event hit Other Node

Now “Event any damage” and “event hit” are corresponding together and in “event hit” “other” node means the actor or pawn who used “event any damage” ?

My second question is rather then implementing other node I used “get player pawn” but even though I didn’t touched to projectiles, after I launch my game and 5 second passes, Event hit is working. I didn’t interacted with projectile collision why is that happened?