TriggerAnimationEvent Doesn't emit anything to the graph

Hi. I write here because I followed the procedure to send an Animation Event in the revolver graph. 

For first I created an Event, TriggerAnimationEvent with FireEnd as string value.
After doing it I made this in the Graph editor:

This graph works ONLY for the mouse input fire transition. So OnPressed it plays the animation executing the transition, but, the Event which should set the variable Fire to false doesn't emit any input to the graph, infact the animation doesn't return to Idle-Run blendtree state.