The difference between a handy attempt to resist being handcuffed, and head-locking the arresting officer, in 2 seconds. For the first eight seconds, "Mo" plays pat-a-cake with the officer trying to keep from being handcuffed. Mo then makes a near fatal error of head-locking the officer. Two seconds later he is out as cold as a cucumber.
The officer cannot allow the perp to escalate the situation and take the advantage.
The result is a text book bodyslam KO.
Mo will have plenty of time in lockup to work out his aches and pains.
Don't do this at home, these are trained professionals, on a closed track.
Here is the Russian version, not as clean, but still effective.