There's nothing magic about .50BMG. It's just a small arms cartridge, albeit a large one. It won't send human bodies flying through the air, or explode them like prarie dogs. It won't even come close to doing these things. It will make the body twitch more so than whatever rifle was used by Mythbusters, but that's about it.
.50BMG from a rifle length barrel is, approximately, a 650 grain bullet at 2800 fps.
If you want to make a human seem like a prarie dog, a better start would be a 25mm auto cannon as mounted on the Bradley. A 2300 grain projectile at 4400 fps.
I could have sworn on the last shot there was a secondary explosion of some sort, like the bullet hit a guy's RPG round in a pack or something. Did you notice that? If it was just an animal, why the explosion? I'm not disputing you. There's a lot of phony stuff on the Net. But the secondary explosion seems odd if just an animal.