I'm on mobile so can't really see.
You were up on the wheelie when it cut, correct?
Gust of wind? Rut in the road? Extreme change of throttle?
I would assume you overcorrected to the right.
I would assume like when regular riding and you have a tire slip, the less input you put on the bars and allowing the bike to "settle back in" will likely allow it to correct itself. For example, when you're going around a curve on 2 wheels and the rear tire slips, often people wind up highsiding because they panic or put an extreme input into the bars to try to correct it. Where if they don't do anything, the rear tire usually will regain traction and catch itself. It might jerk, but if you lift off the seat a little bit and let the bike do what its gunna do, it'll straighten out most of the time and if it doesn't, you're just basically a passenger at that point.
So I would assume it was your overcorrection that caused the bike to fall.
My best guess!