[masraum]

I'm not sure I really understand what you're asking. It's completely normal if you get sideways and you "correct" (steer into the slide) for the traction of the rear tires to eventually push the car back towards center, and if the conditions are right or you don't get your counter-steering right, the rear will then go the other way. It's called fishtailing. In this case, since he was on the edge of the road, he probably had some help from the curb and wet grass., but it can happen in any slide in any condition.