eye witneses
I dont really like to speculate before the facts but as surfer close to the site reports he saw the plane with the splash sound, it makes me wonder why he didnt hear the sound of engines spooling up if a GA or stall recovery initiated, those things are very noisy over the open sea and if Full throttle was applied surfer would be aware of the plane earlier than the splash sound. He would state something like, i heard the plane and then it splashed into water etc..
Its just what came into my mind when i read his story..