What are you talking about? He was looking pissed off before he got onto the pitch. He didn't celebrate the goal with his team mates, just punched the air and walked away and apparently walked straight down the tunnel at the final whistle according to some-I don't really care, but it sounds like he was pissed off about something, and if i had to have a guess i'd probably say that it was because he wanted to be out on the pitch.