I was very near a high performance taidragger that was being demonstrated by the pilot, the aircraft made a steep climb and at about 250 ft stalled and started to enter a spin, the aircraft hit the ground and a parked aircraft and burst into flames. I don't think any one could have survived that crash. I and several other bystanders had to restrain a man who had been so near the crash that he had suffered very bad burns but was wandering about in a semi dazed state walking away from the accident site ( and the rapidly approaching ambulance ).
Between the bystanders we managed to get the guy into the care of an ambulance crew quite quickly.
On the whole a terrible day, it made me much more considered about the way I fly aircraft.