RedactedNarrative: Vessel #1 was tubing with 3 persons on a couch style tube.  He noticed vessel #2 was following 2 close to his tube and was concerned.  Vessel #1 turned left to create distance.  Vessel #2 continued to follow vessel #1.  Vessel #1 turned left again and one of the passengers fell off the tube and vessel #2 ran over the person in the water, causing injuries.   Operator of vessel #2 was cited with unsafe operation of a motor boat and excessive speed.