RedactedNarrative: V1 was grounded on the sandbar on the north side of Peanut Island with 7-8 occupants on board.  The female occupants sat in the bow of the vessel while four of the male occupants were in the water attempting to push V1 off the sandbar.  The occupants would not identify who the operator was.  The vessel was in gear and victim stepped to the starboard rear of V1.  He was struck by the prop causing lacerations and fractures to his right leg, left ankle, and left hand. Right leg amputated above knee (surgical as result of injuries), 5th finger left hand amputated, fractures to 3rd and 4th fingers left hand, fractured left ankle