The move WAS intentional. It was at a ski show for entertainment. The move is basically a power slide with full bladders. I don't understand why he would do that with a bow rider though. It must be a V-drive boat considering it was a right hand spin. We used to do that with the resorters' with direct drive and the spin could ONLY be done successfully to the left. I speak from mucho experience.
Beware MasterCrafts for sale in that neighborhood.