Indeed, I wonder that did referee buy barcelona win the match? Biased game, sick result. Valencia should win, but they lost.
It is a well known fact that referee might take sides sometimes and there is nothing that they could have done about it. They are the ruler of the game and could make every decision of their own unless it is clear that a foul is committed besides that it is hard to know for sure if it is a real foul or that player is trying to dive anyway