Agreed. I think he was our best player in the first half. Completely owned Ronaldo. His error was very big though, so in the end it's a bad game. He had time to see the trajectory of that high ball by Bale and he still missed the header. Just a big error, that is costly in these games.
While he had his good moments in defense he was rather bad in general. He and Alba most of all were our big weakness in defense which Real was really able to pound on later in the game.