RedactedNarrative: Vessel 1, had 8 people on board. Person #1 was the operator, cruising at approximately 2-5 mph. Person #8 was bow riding beyond the front pontoon gate with his feet in the water. Person #2 did something to spook person #8.  he fell overboard and went under the vessel surfacing at the rear. Person #3, entered the water with several type 2, personal flotation devices to place on person #8.  They were able to re-board the vessel, person #7 administered first aid to person #8 ankle/foot injury from prop chop.  Person #8 was taken to shore by a Ranger Patrol boat to an awaiting ambulance.