Yep - fortunate he landed in shallow enough water that those rushing in could stand up still, and flip the plane back over - only a few feet deeper, and with no bottom to stand and brace against, those good samaritans would have had to have forced the canopy open instead, a far more difficult task probably.
Forced approach ditchings, I'm sure guys here will know, is it just because of the gear being down that this plane and others I've seen flip over so easily? Or is it just the nature of the friction with water - seems like a lot flip over like this, where as some just skip a bit then come to a stop upright. I remember reading about those rocket assisted Hurricane's put on cargo ships, and their SOP was to do a ditch/water landing and get picked up after shooting down the Condor or whatever long range aircraft was harassing their convoy. So, based on that I'm assuming it must be possible to consistently do a flat water landing.