Tough one IMO. This isn't a studs-first challenge--he plays the ball away cleanly with the top of his foot. The natural movement leaves his studs hitting the late arriving opponent. I can, unfortunately, rationalize any result here. (I'd like a better sense of where the opponent came from to more clearly evaluate the culpability--I can't tell from the clip if he was lunging in late or if he pulled up because of the aggressive challenge.)