Regenerator tanking Ex bites and gunfire

The prisoner stood there, arms spread wide. His clothes had been shredded by the exes, and his skin was smeared with gore, but he was smiling. A dead woman latched onto his forearm and tore a mouthful of flesh away. Another one gnawed on his calf. The white-haired man didn’t seem to notice.
Stealth’s fingers shifted and empty magazines dropped from each pistol to rattle on the platform. She reloaded in seconds and was firing again. Freedom raised his own weapon and Lady Liberty thundered. The trigger-happy guard joined them, but Freedom could tell the man was just spraying bullets.
The prisoner flailed under the assault. His skin ruptured and blood sprayed across the lawn behind him. He staggered back and dropped on the grass. The exes chewing on him were torn apart by stray rounds from Lady Liberty’s bursts. Their remains fell on either side of the man.
…
The prisoner rolled over and scampered across the lawn on all fours.
Stealth tracked him and led her shots like a decorated marksman. Freedom saw her score half a dozen hits before the prisoner got back to his feet. The white-haired man sprinted to the end of the block before glancing back, and Stealth rewarded him with three rounds in the face. His forehead burst apart and he slumped against an SUV, but he was moving again before he hit the ground. He shook off the impact, rolled under the vehicle, and vanished.

Excerpt From Ex-Communication, pg 366-367
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546