There are many instances when a hunter should reconsider taking the shot at their prey. You aren’t comfortable with the shot, can’t catch your breath, there is brush in the way, etc. When bear hunting you should be aware that there are some shots that should be avoided.
Bears have a very large shoulder blade and humerus (upper arm bone). These act as shields to bullets and arrows. Their heart is well protected behind these if the front leg is back along the body.
The best shot on a black bear is a quartering away shot with the front leg extended forward along the side you intend to shoot. The vitals are all exposed for a proper kill shot.
Take this into consideration before you pull the trigger or let that arrow fly. Nobody likes to chase after a wounded bear at one in the morning in the darkness unless your buddy likes getting his ankle bit just so he can shoot one with his glock handgun.