SC, is that cobra head, the 540 system, the same as on the UH1L/M?
from all accounts the second hydraulic system doesn't help too much, so if you happen to loose it just at the wrong point in the turn then maybe you cant get back on track and just squash in, as he seemed to do.
I didnt see too much wrong with the turn, apart from finishing a bit too low, couldn't see the balance and all that, but there is no reason why you cant have, with the UH1's at least, the line of the horizon straight up your windscreen sky in one window ground in the other, from about that height, maybe a little higher, and still pull out of it, all in balance and without pulling excess G's.
just relooked at the video, and once he starts turning, it looks like he doesn't change angle at all, so loss of control/hydraulics is on the cards...
how do those things go doing those sort of turns at full speed? I'm normally doing them slower with a load on...