RedactedNarrative: Passenger/Injured was assisting a fellow friend/tuber with removing a rope from the prop of a pontoon. Passenger/Injured entered the water at the rear of the pontoon and as he went into the water, he was cut by the prop of the pontoon. The Operator advised the prop was not completely in neutral at the time Injured was cut. Operator doesn't know for sure if the propeller was engaged but it could have been. Injured was transported to the hospital.