c. if they are walking I can usually get them to stop. The others are usually 3/4 to full throttle.
Watched my grandfather shoot a deer in the back of the head while running away from him when it jumped a fence at 200 yards. It dropped on the fence. He was great at running shots, but he would practice them all the time. He built an apparatus that used a clock mechanism (one where the second hand was moving smoothly, not jerking) and attached a long wire arm onto it with a double loop at the end. He made small deer shaped cut outs that slipped between the loops and set the thing up in a hole. The paper "deer" would pop out and "run" along the top of the hole for a split second and he would shoot freehand at it with his .22. It made him great at split second running shots.
SS
