Quazbotch, its kinda hard to explain, i've been looking for a video but ehhhhh.
basically just a slash turn. even if you made it so that its a seperate key that makes you do it, even just make a butter/revert key so that when you press it he rotates as he proceeds down. that way, we could tap it and make it look like a sliding/slashing turn, or hold it to make it look lik ehe butters off cliffs.