I think the guy on the video did the right thing. If it was me, I'd consider that I flubbed my shot, the other guy didn't. As others have said, he drew first blood. If I'm hunting close enough to another party where I can walk over that quickly, its likely that they're already known to me. Wouldn't bother me to let someone I know borrow my gun for a shot. Doubt I'd let someone wander off with it to track a deer though.