[St Charles Owl]

But he was behind Foster and only in front of one defender Dawson so offside,

They covered this incident quite a lot over here on tv. Antonio being offside wasn't the issue, he was clearly offside, the question was whether he was interfering with play. Replays showed he made a move towards the ball and actually collided with the keeper, so in the eyes of the ref and his assistant, he was interfering with the play and therefore the offside was flagged correctly.