That's my point. If they'd moved up quicker then it would have been more obvious that he was offside. It wasn't obvious at the time and nobody appealed or complained. They just weren't concerned about the threat, not because he was in an offside position, they just weren't on the ball. The fact is that Mata was halfway between our right back and central defender and in quite a bit of space. True he was offside, but too close to leave to chance or to an assistant ref with the sun in his eyes.