berserk

After seeing his sister stabbed to death, he went berserk and attacked the killer like a wild animal.

[T]he writer conjured up a dystopian fantasy more berserk than anything you might find yourself listening to in the small hours at the Stone Circle.

In amongst the strife, Scott McTominay, whose stoppage-time winner against Israel sent Hampden berserk, and Ryan Christie offered signs of an attacking pulse.