Turb in the water
It is very easy to tip a Turbulent on its nose when taxying on soft ground as they are very tail-light.
so it is not surprising that it flipped over so fast. But the main thing is the absolute skill of the Tiger Club display pilot having the forethought not to ditch too far out, but not too close to very shallow water and most importantly not on a beach crowded with spectators. Well done, it must have been very frightening being upside down in the water. Hope it gets repaired soon as a historic aircraft with long service in the club -- I remember flying it years ago.