I've watched the vid a few times now
it appears to start with a flicking maneover at the top of a loop (possibly the second half of an Avalanch/Porteous Loop).
He then continues the loop but does not pull too tightly on quarter 4 so that it appears to finish just above the river. Had he not relaxed the pull he would have finished the loop several metres higher at a slightly reduced airspeed.
The next bit is a bit lost behind a spectator's head but it appears to be a Loncevak off an up 45 line. The issue appears to be the last rotation of the decaying Lomcevak as he struggles to make it stop. My guess is that the last rotation was unplanned/unwanted. He then split S's off that and smites the water.
So - IMHO Lomcevaks can be unpredictable and although very exciting to watch ought not to be attempted so close to the surface. IMHO that was his big mistake.
As an aside; I believe (and I've only ever flown 5 different ones, which included the LAA aerobatic test flights for permit issue on two of them ) that the Christen Eagle II has an AEIO360A1A/B with generally a two bladed Hartzell metal prop. The current thinking amongst my IAC chums is that these should not be Lomcevaked as the heavy prop during gyroscopics can put sufficient stress on the hollow crank to fracture the crank and cause loss of propellor in-flight. Trying to land one without some 60lbs of metal at the pointy end would be errr challenging, as the CoG would march right out of the back of the envelope and possibly even off the graph!
Tragic shame for the Pole, his family and the spectators. However it does remind me a little of the TopGun line about egos, cheques, body and cash.
Stik