Just after Nani's dismissal, Giggs made a rousing gesture to the crowd.
Giggs told the Mail on Sunday: "I’ve never done that before! I think it was anger and obviously trying to get myself up. I was pumped. The crowd had been brilliant all night and I wanted to get them up and was just looking for that little bit of edge where it could help us. I didn’t plan it. I’d seen the ball go out for a dead ball and just felt that rush of adrenaline. It was one of those special nights at Old Trafford when sometimes you do things that, you know, you don’t plan. It just happens.
"I’d initially gone over to tell him Nani was looking at the ball. I’ve gone back to my position on the edge of the box, because they’ve got a free-kick. I was actually looking at the referee when he did it (showed the red card). I’ve never, ever experienced a shock like it on a football pitch because I just didn’t expect it. And I’ve never seen a stadium in shock like that."