Yes, indeed sad, and the poor pilot is feeling too terrible for words, I feel for him.
He was in fact starting the aircraft, not limbering the oil, but had the throttle set slightly too high, the aerie was in fact chocked, but ony on one wheel, instead of both, as it should have been, of course as the engine sprang into life the aircraft did a graceful pirouette around the one chocked wheel and of course the final bow for the audience.
The damage is not too bad, could have been much worse, or even injury to persons, thankfully it was just prop tips and an ego.
Forget about it boy, oops happen to all of us.