Quote: leicester_rhino "which makes him pulling down Carmont even stranger'"
Let's say McGuire lets him run and tracks him as he supports Richards on the inside.
Richards gets to Donald, draws him and passes inside to Carmont.
McGuire makes the tackle on Carmont, who as he's falling pops the ball inside to Sam Tomkins (or someone else) supporting up the middle of the field, who then streaks in under the posts to win the game for Wigan.
Taking out Carmont solves the whole problem - if he isn't there, Richards has no-one in support and is forced to kick.
Now put that whole sequence of thought into the second that McGuire had to make his decision on what to do next.