So, WTF is going on with Bobby?

I just finished my first play through today and have started my second, so try not to give any specific spoilers. In my first play through, Ryan shot Bobby point blank with a shotgun, and it seemingly bounced off of him?!?!!? He isn’t and never was a werewolf to my knowledge???? What is going on here? Anybody have any theories or answers? I can’t seem to find anything about Bobby being a supernatural hunk entity on this sub or anywhere else online. Am I missing something obvious?

TLDR: How did Bobby have a shotgun shell just bounce off of him? Is Bobby a werewolf, a supernatural hunk entity, or something else?