Exes holding back St George / Cairax’s bite piercing St George’s flesh

The hero lunged up, dove in, and jerked back. A pair of exes held his coat. One was chewing on the leather, trying to work its teeth through a pocket flap. The other reached out with its free arm and grabbed a handful of hair.
He spun with his fist out and broke off the hair-puller’s jaw. The fist swung back and shattered its skull. He shook off the leather-eater and a bullet exploded its head as it stumbled back.
A voice shouted something between the gunfire. Billie, up on the roof of the trailer.
He turned in time to see the demon’s head lunge down again. The creature’s mouth was a Venus flytrap of tusks and fangs. St. George threw his arm up out of instinct and the dead thing’s daggerlike teeth punched through the leather sleeve.
Into his arm.
Agony, more pain than he’d felt in years, roared through him. The jaw hinged shut like a machine and one of the huge teeth scraped against bone as it pushed deeper into his flesh.
Cairax Murrain grinned and yanked him up into the air, shaking its head like a crocodile. St. George’s shoulder twisted and he felt himself flail. He heard people screaming and realized through the pain he was one of them.

Excerpt From Ex-Heroes, pg 419-420
Peter Clines
https://books.apple.com/us/book/ex-heroes/id585738407