Forget that it was Man Utd, Liverpool, whoever. Just explain to me what right a player has to wrestle the ball off an opponent when it's that opponent's kick-off. I've never understood it. Just don't get it.
Let's say we're in the last few minutes of a game and the ball goes out for a goal kick. Does an opposition player have the right to wrestle the ball off the goalkeeper? If not, what's the difference?