As someone pointed out earlier, the surfer dude who went to the rescue seemed to be suggesting that the first he knew of the plane's presence was the splash as it hit the water.
If this is to believed then the engines were either out or at or just above idle. A high bypass engine spools up in less than 6 seconds so even a partially successful attempt at a go around would be making a hell of a racket before it hit the water. :-(
Am I right in thinking we haven't seen any pics of the post-crash engines yet?
SoS