RedactedNarrative: This incident was reported 90 minutes after the fact. Watercraft #1 was doing figure 8s on the south end of the lake. Watercraft #2 was pulling a tube with one occupant on it in the same area. Both operators stated they did not see each other. The two watercraft collided with each other. The rear portion of Watercraft #1 collided with the left side of Watercraft #2, which caused Operator #1 to fall off. After the collision, Watercraft #2 turned to the right, away from WC #1. The tube with the lone occupant then hit WC #1, causing the tuber to fall off. WC #1 was unoccupied when the tube struck it. The tuber received a fractured tailbone and a torn glute muscle. Operator #1 was wearing a life jacket and so was the tuber behind WC #2. The occupants of WC #2 were not wearing life jackets. Alcohol was not a factor.