From watching the vid, looks as if there is a ridge of snow, that the side of the hull caught. lifting the out side just enough for it to let in extra air flow, then combinded with the direction of the rudders, being turned in the opposite direction causing the hull to flip back, with nothing to stop it from going all of the way over(boat being air born at this time) causing a roll. When this happens there is only one thing that you can do(if your quick enough)let off of the throttle, counter stear, get back on the throttle. To do this and for it to work, it must all be done in less than a second. Other times you'll get a warning just before it becomes in a side slide blow over, that will give you more time to get it back under control(about 1-1/2 seconds) Better have strong batteries to keep up with needs to be done.