Heh, I was a defender, I know the rules plenty well enough. Yes, tackles from behind aren't allowed, and i'm not denying they were fouls, because they were. But to give a yellow for the very first one is just anal, and it means he needs to book for the rest. Standard is to warn them for the first 2 or 3, and if it's persistant, then book them, another warning or 2 then send them off. Why didn't he book the Serbia scorer, jumping into the crowd/ott celebrations are also bookable.
If we don't see a red this half i'll genuinely be shocked.