The answers so far only serve to emphasise what is becoming clearly ridiculous. In this case no head contact occured so play on, nothing to see here. If either head is 2 or 3 cms further over than they are and there is contact, that's a red card and a ban, even though the action is exactly the same. It's all very well issuing guidelines regarding procedures around head contact but it took a team of four several minutes to determine whether or not head contact had occured. How does that help me at the weekend? I get a one off, quick glance at the action and have to make a decision. In this case, I'm pretty sure I would have seen that as a dangerous tackle, penalty white and yellow card blue. The point I think I'm making is that issuing guidelines and procedures that can only be fully followed if you have a TMO is a cop out and does the wider game a diservice. It raises unrealistic expectations of players and coaches that the referee will be able to follow them. In this instance Henderson's phrase "that can't be a nothing" resonates.