RedactedNarrative: Watercraft #1 (a PWC) was pulling a tube with three children on it. One of the children fell off the tube, so Operator #1 turned the PWC around to get the child. As he was turning around, the tube, with the other two children on it, swung around and hit an anchored pontoon boat (WC #2). One of the children on the tube struck the side of the pontoon and fell off the tube. He was taken to the hospital. Life jackets were being worn by all involved. Alcohol was not a factor.