GSW to the chest from a handgun

[mermaid]

I originally posted this at little_details; apologies to anyone who sees it twice.

Setting: 2011, Honolulu, USA. It's pretty much our world, with added werewolves.

The character, S., is a fit, healthy Navy SEAL in his 30s (yes, this is Hawaii Five-0 fanfic) who in my story is a werewolf. Lycanthropy gives him faster healing and greater physical resilience, but this is a closely-guarded secret and not known to the doctors treating him.

My questions mostly concern the plausibility of my scenario. Some details can be glossed over, since the story's narrated by a shocked and scared civilian with limited medical knowledge. I'd like to be accurate, if possible, but I'd settle for not making readers roll their eyes!

( 1. Gun questions )

( 2. Medical questions )

Research:

- google (variations on 'handguns', 'self-defense', 'gunshot wound', 'sucking chest wound', 'intubation', etc)
- Wikipedia articles (ballistic trauma, handguns, 9mm, chest wounds, chest tube, pneumothorax, hemothorax, intubation, etc)
- I've looked at all little_details entries tagged "medicine: injuries: gunshot wounds", plus some of "medicine: injuries to order" and "weapons: firearms"
- I've also read parts of two free ebooks: Di Maio, Gunshot Wounds and Dodd, Terminal Ballistics, though I had some trouble understanding them.

Thanks in advance for any help you can provide.