Flanking the bear and shooting from the deck so to hit the exposed vitals and pass through both lungs seems a bit less taxing on a 45acp pistol bullet than a shot into covered vitals from a head on shot into a charging bear. It highly unlikely a bear would live too long with a hole through both lungs, and from a flanking position upon the deck, a CNS DRT kill would not be as pressing, than if the bear was a step away from knocking him off his feet.
I'm curious if he continues to keep his only firearm, the 45acp, outside in his truck at night. Doubt it.