arrow hit right where he was aiming- right behind the shoulder, halfway up.
My guess is the arrow caught the first lung, I like to be above the 1/2 mark on a deer from a tree. 15 ft is low, but being 10 yds away he might have been close enough to miss the second lung. Do to the angle, but there is wealth of information on this site on what to do after the shot.
Maybe we can get this site to hold an online seminar on what to do after the shot. Setup different shots and what the hunter should do. Kinda like a game, but I think it should be more serious then game status. Deer hit in this location, show a video of a deer running off hit in the location. Then let the hunter decide what to do next.