On Harrison's TD run, take a look at the two players that are spot shadowed. The one to the left is Fitzgerald - who made the tackle (and neatly saved the TD). The one on the right is Antrel Rolle. Fitzgerald actually runs into Rolle, and is hindered in his attempt to get to Harrison. Rolle is standing on the white part of the sideline, which is technically not allowed. And dumb in any case.
So, if you want to argue that the game was won or lost on this play, then credit Rolle with the TD-producing block!