Depending on how far you followed this blood trail. Say 300yards? I would guess that broad head penetrated the shoulder, and Id continue the search after he is given time to lay down and get stiff. I use mechanicals, always have, never lost one deer with them. but you gotta put it in the sweet spot. When in doubt dont shoot. Course your always gonna have the unknown happen, but stay on him. Your allowd to track him on other property. I'd say you owe it to the deer to find him.

Just me tho