Well, maybe hands should be closer to head and more left but that's correct way to do a kick up?

...how the heck are his arms bending that way when he leans to the ground?

Yeah, it looks like the victim has wires attached to the back and is being pulled away. Just like the movies. xD One thing you could try is add more arc to the trajectory, and have him/her slow down as he/she reaches the pinnacle of that arch.

Or, you could just leave it as is. It is pretty hilarious. Good stuff.