He went completely ballistic.
He seized the head of the biggest beast, wrenching it toward him. Other Cryenas scrambled away, but many jaws still lunged at him, refusing to abandon their meal.
Fang’s fingernails tore at spotted flesh, his arms found strength to break bones, a couple of well-placed kicks cracked their thick necks sideways, and his teeth gnashed at anything that would bleed. Fang had finally snapped, and he would not back down.
It was only when he paused for a few ragged breaths that he saw that most of the Cryenas were dead or had run away, and he had torn the pack leader almost completely apart.

Maximum Ride Forever, Chapter 21