RedactedNarrative: Vessel Operator was getting a tube-rider set up when a passenger realized the tow rope fell off the hook on the boat and fell into the water.  Operator was moving the boat backwards to get closer to the rope.  The Injured/Passenger was at the back of the boat attempting to retrieve the line when she fell/slipped off the transom and into the water.  The Operator was at the controls and operating slowly in reverse.  When the Operator realized the Injured/Passenger fell into the water he put the boat in neutral and shut off the engine.  The Injured/Passenger sustained a laceration to her right thigh.  She was transported to the hospital, treated and released with stitches.