you can either send an event dispatcher from your pawn to the enemy
or you can create a custom event on the enemy blueprint, then cast to the enemy from your pawn, and then execute the custom event from the pawn blueprint
I did something similar here. I create a custom event on my checkpoint blueprint ( would be your enemy bp)
then on my pawn, i did a line trace, and when the line trace hits something. It triggers the event on my checkpoint:
