Psychology played a big part in this game.
The surprising return of Rooney had a devastating effect on Bayern.
The way Müller looked at him, the way the keeper and left-back played, they were already 1-0 down.
Even worse, within 8 minutes they were 2-0 down.
Frank Ribery, not playing well again, had a major part to play in this match, goading Rafael, especially after his yellow. He ensured the young Brazilian got sent off, which turned the match around.
Then there was that strike from Arjen Robben, who was just about to be taken off, because of his proneness to injury.