Hmm. Interesting incident. He had quite a bit of flap on for someone who never intended to leave the ground, although there might well be a good reason for that. As said, a gust or emerging from a sheltered area obviously gave him flying speed. His fast taxi was too fast for the conditions.
He had rotated to quite a nose-high attitude in the second frame though! I wonder what margin he had over stall speed? If that wasn't deliberate he was seriously caught napping.

I suspect there was probably a crosswind which accounted for the fact that he was crabbing down the runway once airborne and with no room to correct it he probably touched down with quite a bit of yaw, causing the aircraft to roll over to the left as the landing gear contacted the ground.
By far the safest thing to do would probably have been to open the taps and do a circuit, airworthy or not, rather then risk running out of runway before getting rid of the energy. Would have made the ensuing paperwork a bit awkward though!
It would be very interesting to see a video.
Kevin