RedactedNarrative: Vessel 1 was maneuvering towards Swing Bridge near the northside of Island 3 in the north bay of the St Croix River.  Operator reported he had taken over operation as everyone on boat had become intoxicated.  Operator stated he wanted to go fishing and began maneuvering boat near a spot to fish.  Injured person did not want to go fishing and for an unknown reason jumped off of the front of the pontoon.  Operator reported seeing Injured person surface and grab onto front portside of the pontoon.  Operator stated he continued to maneuver the boat.  Operator stated he then lost sight of the subject in water and then the subject surfaced near the rear of the boat and climbed up the back.  The Injured Person had two large lacerations on his foot caused by the prop.  All other passengers remained aboard, seated and not injured.  Operator reported he was travelling less than miles per hour as he maneuvered in the boat.