What was up with Mascherano during Copa celebrations?

Javier Mascherano, one of Barcelona's key players, seemed sunk when the Copa del Rey final ended. The Argentine still had not got over his first half red card which meant Barcelona nearly played 90 minutes with 10 men against Sevilla.

He took down Kevin Gameiro in the 36th minute and was dismissed, an avoidable red card. It was the second time referee Carlos del Cerro Grande has dismissed him. It changed the dynamic of the final completely. 

During the celebrations he seemed alone, shut down, exactly the opposite of his team-mates who partied like it was their first time. The reason is that Mascherano, owning to his professionalism and the way he takes responsibility, is affected seriously by these things.

Years ago he made a bad error against Milan and came out and said: "The team, lamentably, has had to suffer a mistake of mine. I hurt because of the result, because in important games like these I can't make mistakes."