I agree with elkaddiction as well. Deer can always move when shot at long distances. Sometimes its not the obvious reason, alarm, but because they are feeding or scratching themselves or whatever. Additionally, the speed of sound is at 800 fps, and that is still 3 times the speed of a bow. If alarmed a deer can easily move and you don't hit a vital. Ghostinthewoods point is interesting, and I guess if there was wind, or farm noises maybe a closer shot tips them off sooner. But still an arrow at 35 yards gets there alot faster than an arrow at 70 yards, so the movement want be as exagerated.