RedactedNarrative: O1 observed a water bottle floating in the lake. O1 stopped the boat and the victim jumped in the water to get the bottle. The victim swam to the back of the boat to climb up the ladder. O1 thought they were putting the boat in neutral so the victim would be safe. O1 thought neutral was all the way to the bottom of the throttle. O1 inadvertently put the boat in reverse. The victim was hit with the propeller on the right leg at the knee. The victim received a laceration to the right leg that was 3-4 inches long. 
  
  The victim was swept between the pontoons and came up in front of the vessel. Other passengers on board brought the victim into the boat and applied a tourniquet to the injured leg. The victim was transported by RCFD to Rapid City Regional Hospital for treatment. The victim was admitted into the ER. WCO interviewed O1, P1 and the victim. All stories were consistent. There was no alcohol or illegal substances on board the vessel. WCO determined operator inexperience was the cause of the accident.