Free: Contests & Raffles.
When you say "back shoulder" are you meaning hind leg?If so, sounds like maybe a lower gut/intestine hit or muscle mass of the rear leg? Did you recover the arrow? Was there any green or nasty smelling material on it?If gut hit, it will likely lay down because it will be very sick shortly, may die in place if not distrubed tonight.If leg muscle, unless you cut a major artery, could survive. When you say you are going to look after church, are talking tomorrow or an evening service tonight?If you are talking about waiting till tomorrow late morning after church, I would sugguest skipping church, be at your spot at first light and start your search, slow and methodical. If you wait too long into the day, you likely will lose the meat to spoilage, best chance to salvage is find it as soon as possible and before day temps start climbing.
Show the video to somebody who knows what they are doing. The hit might be fairly lethal depending on angle. You say it barely penetrated? Could it have hit the leg bone or are you shooting super low poundage?