Peter sighed, "he should help because he's helped the pack more than once get out of near death experiances it was David who went in the most when I'm gone somewhere else to help another pack johns the back up medical person Bruce only trusts fully. Bruce didn't really meet john at the end of a gun, he just met him while he was going for a run john got lost and he said he already knew about lycans and vamps so Bruce just led him out of the forest. Ever since then John had been out back up medic he's good at what he does.