From speaking to the witnesses:
the RH wheel & ski was significantly lower in the water than the LH as he did his 2nd run.
The Skis has an intake on the bottom and a hose fitted to the top which fed into the hopper.
from the video hi RH ski made a -ve AoA at some point and dug in
Flipped onto nose & spun to the right - stopped hard.
ATSB were due to get here about 7pm tonight. Up to them.
Col's age not a factor. No disrespect Amos2 but I did my LL Aero's renewal with him 6 months ago and I would bet he would have whipped you.