Help in special attack in zombie survival game.

Friends, Good afternoon
First excuse my English is not my native language

In the Unreal Engine I’m not good at programming, I like modeling, level design, sound… I’m doing in a zombie survival game.
I have a zombie and her special attack she screams loudly calling zombies next, I did the programming of her drive and attack but in the middle of it, I’m not getting to make this attack that by seeing me she screams, gets a mixture of an attack melee with the start of the Scream , I will post the screens of the blueprints

NPC Blueprint
Behavior tree

Could someone help me, thank you