I know the pose is odd, but I tried to get across the fact that he was quickly turning while slashing with the movement notifiers (wind turbulence lines, whatever you want to call them) but I guess it didn't turn out right. I tried getting the right pose but this was the best I could do. (Hey, I was using myself as the model for the pose.) And the pose actually did work if the slash followed through.

By the way, here's the final version: (comments please) link