I am simply stating if he chooses to shoot at a running deer, he will have a better chance of delivering a good clean kill shot by picking a spot ahead of the deer, and waiting for the deer to arrive.
It enables a hunter to deliver a good clean kill shot, rather than trying to follow the deer and shoot it.
I know it works, because that is how I shoot at running deer. You won't be moving when you squeeze the trigger.
Up here in Maine you need to shoot this way anyways, because of the heavily forested woods.
Most Maine hunters will agree with me on this. I agree it is better to shoot at a still deer, but we don't often have that option up here.