Bastardos - typical MS with changing winds (windsocks nearly always seem to be pointing in different directions), only vector not used in the show was 10, but even that was used by a couple of a/c first thing in the morning and prior to the show starting.
Harvard was landing on the most into wind vector at the time - unfortunate gust of wind (10kts +) with change of direction while tail still up slightly and wheels about to go from grass to seal at differing times.
Ground loop was lucky as it saved the crowd (and myself) from what initially looked like the aircraft ploughing straight in amongst us.
Very lucky the port undercarriage didn't collapse - guess it was built to withstand all those student landings! (Also meant the pilot could make a reasonably sedate exit as the a/c ended up pointing the way they needed to go...
)