RE: Speed is all you need! (?)
This is a technical term . . . but I need to make a correction. DEER DO HAVE CLAWS! Four of them to be exact withh the front being larger than the rear. They are called " Dewclaws!" [X(]
Unless you are shooting faster than the speed of sound the deer will react to your shot by ducking . . . hence the recommendation that the best aiming spot is 1/3 up from the belly. If and when they duck, they are then hit in the center of the lung area. I won' t argue with known fact.
I have shot deer that did not duck . . . but most have. It ain' t much but may be a prime reason that some arrows go over the back