The points made already are good ones, and there is another. Unless you are shooting a two blade BH not much is accomplished by remaining in the animal. Think about pushing a 3 or 4 blade sideways against something-you are always pushing against the flat side of the other blades. Also, the arrow staying in the deer will create more pain - making the deer run harder, and farther, than it normally would. Deer with arrows in them take a loong time to slow and stop as a general rule.