[just another ref]

Originally Posted by BillyMac

I can see your point, but I'd like to pay Devil's Advocate.

If a player observes, in advance, that a rolling ball is about to strike his already on the floor leg, and said player doesn't move is leg out of the path of the ball, is that not intent to strike the ball with one's leg? Or is this a case of the ball striking a leg rather than a case of the leg striking the ball?

A kick must be a positive action. A player is not obligated to move this leg to avoid contact. And it is about intent. It is possible for the foot to be neither on the floor nor stationary and still not be a violation. The foot of a running player strikes/is struck by the ball. Play on. Intent must be judged.