I'm confused by the general way Skyrim's attack mechanics work in that they even hit the corpses even if you're not even remotely aiming at them and instead swinging up in the air.
Weapons have more range than what it shown visually and corpses, if I recall correctly, tend to have the height of their hitboxes be higher than what is visually shown.
Fus Ro Da them out of the way. Clears them up in a jiffy.
There's many ways to clear up/move corpses but there really shouldn't be a need. All that happens when you slash a corpse is that a blood effect plays. That's it. It doesn't move or react to getting slashed in any way, shape, or form. It's quite an annoyance when I have to move corpses because of something of such little value.