Not any of the hunters that I know....energy is a pretty simple calculation that only includes velocity and mass. Not sure why you have velocity and distance in your calculation. They are directly proportional. The further away an animal is, the more loss of velocity. Distance is irrelevant. Only velocity at that distance matters.

As for animals falling down and getting back up, it's pretty easy to explain. The temporary disruption of the nervous system wasn't enough to keep them down and the permanent wound chanel wasn't instantly lethal. Energy doesn't kill except in rare circumstances. The kenetic energy of a bullet isn't that great in the scheme of things.