RedactedNarrative: Operator stated he was towing the victims on a tube; he was unsure of his speed but knew he was making it challenging for the boys to hold on.  He said he didn't know why the boys fell off because he was not watching them.  According to victim 1, the tube hit a wave and he lost his grip.  He also believes victim 2's head hit him in the abdomen and ribs on his left side and he hit his shoulder on the tube - all in the process of falling off.  Victim 2 gave a similar account; he stated in the process of them falling off the tube, they collided causing the injuries.