Someone made an interesting point at Judo on Monday. It was that in Judo (and wrestling, and other similar sports) have the ability to stop the action with a tap. Beyond being able to stop – you are expected to do so before you suffer serious injury. In football, if your position is bad and the tackler is bearing down on you, you can’t simply concede the play at that point. You have to take the hit and the possible subsequent injury.
I’m not sure whether that means anything, but it is an interesting distinction.