Exposing it to an event is a much better idea. The entire sensing tick could be exposed to evens, giving easier access in in tasks, services and decorators . Though note that mine is if the enemy is seen, not the name of the enemy actor. The name is handled in a different blackboard key.
I can’t find a way to access the pawn sensing tick. I know I can change it’s interval, and start and stop it, but I can only get hold of it when it actually sees or hears something. Looking through all the nodes available, I don’t think it’s possible in blueprints at the moment.