Could someone please explain to me just when a croc uses its tail unbalance prey. Do they charge out of the water in reverse swipe knock prey off its feet then quickly turn around to grab it with the jaws and then pull it back in the water? Or do they first grab with the jaws then come onto the bank and while still holding onto the animal turn 180 deg., swipe the tail then turn again to pull it into the water? Seems to me like a lot fo energy used here. Would it not be simpler and more efficient to just hang on to the prey and wait fo shock/blood loss to do its work? I have seen a 17 footer take a cow and to me this method was very effective.