Many bears have learned to associate gunfire with an easy meal. An acquaintance is a hunting guide. His biggest worry is butchering a kill before some bear shows up. The two men made a cardinal error in judgement. One should have remained on guard, rifle in hand while the other did the butchering. Any decent pack horse is going to sense the grizz and turn into a 1000 lb neon sign flashing DANGER! These men were just to focused on butchering and not the very real world they were in.