Arrows don't pulverize bone regardless of what they print in broadhead ads, they just don't pentrate bone well, soft tissue great, bone not. This is one reason why I am not a fan of using lighter weight gear. It isn't a cure all, but it can help on borderline hits. If the deer was broadside and you hit the scapula, the arrow wasn't going to hit the lungs, on a broadside standing deer the scapula is way higher and farther forward than most people think, it dosn't block the heart or lungs at all, the only time that could happen would be from a high(treestand) quartering on shot. If as you say it was "behind the shoulder" then it most likely hit the spine and it would have been a very lucky thing to penetrate that.