According to one eyewitness, he dropped like a stone. Sounds awfully like a stall to me. Descriptions from others, are that a wing hit the water first, and he was a long way from being level. The camera in the plane seems to show a fairly level impact, though. The weather hasn't been kind to him, he's grizzling about it. He must have some decent kind of harness to get out relatively unscathed, with minor injuries.