Having seen the footage for the first time, first thought is definitely not an intentional kick to the head, however it is contact with the head, it is a very dangerous way to take the ball for the person trying to contest the attacker. So after some thought, Slater does not take the ball like this every time he goes up for it, he only seems to do it when he has a little bit of time before attackers get to him. I would say this is probably why at times ( when he does this "take" ) he gets to take the ball uncontested, not many people I know wanna get kicked in the head. Do I think it's a tactic? Yes. Does that make the contact with the "kick" deliberate and no accidental? Yes. Will it get ruled as deliberate? No. Should he get time for it? Yes