Finally got him to try a tantrum, but it doesn't look much like one to me! He is spinning or something. What is he doing wrong, I know he's looking over his shoulder, that is probably causing him to spin. http://www.youtube.com/watch?v=LxXoEu5QJmQ
You'll notice that the rotation followed his head. He looked over his right shoulder for the water and his body turned to his right, bringing him down to revert. Look straight back and perhaps a little over his front shoulder to counter the inclination to take it out the back.