When you see someone at a generator, honk the horn button, bottom right of the screen, I believe.
Thing is, Poppie doesn't care about the horn. The other character cares and goes away. Poppie does not.
Poppie doesnt destroy the generators, she just kinda vibes and blocks your view of the hallway. As long as you scare Sammy away you're good
Ah I see. Thanks.