Originally Posted by RCZ

My 3 guesses.

1) Came in too fast, jumped off the gas, unsettled the rear, swung around and went over the curb.

2) Cooked the corner, understeered into and over the the curb.

3) Came around a corner too fast, rear slid out, he freaked out and counter steered waaaay too much, swung out the other way and hopped over the curve.