It was fun to watch. But can we learn something from it? Can someone break it down what were his inputs, and what was happening?
My guess would be that once the rear started coming around on the left side, he held the throttle steady, or gradually started to roll it off - not by much - perhaps 10-15% over the entire escapade. At the same time, he initially turned the front slightly to the right to straighten the bike. Overdid a little, so the rear - still sliding - went over to another side (right side). He repeated similar action, but now by turning the front to the left to straighten the bike. At this point the rear hooked up, but the front wasn't exactly straight because of steering input, hence some visible headshake until the front stabilized.