It wasn't some shirt pull lost in the melee of the penalty box at a set piece, it was a blatant pulling back of Ricardo in an open midfield right in front of the ref, giving them a breakaway opportunity. Not saying he was terrible all game but that was an absolute shocker of a decision from a professional referee. You have to know what foul play is, otherwise you are not doing your job, or you just aren't good enough at your job.