RedactedNarrative: Vessel #1 was engaged in tubing operations. Vessel #1 stopped and was collecting the riders. Victim #1 had just entered the boat from the stern and was on top of the sun deck. Victim #1 had just taken off his PFD when Operator #1 put the boat in gear and applied throttle. This caused Victim #1 to back flip off the boat into the water. Occupant #1 grabbed a PFD and jumped from the vessel to rescue Victim #1. Victim #1 complained he thought his leg was broken. Occupant #1 swam Victim #1 back to boat. Operator #1 circled the boat around to pickup both people. When he neared them, he failed to turn the boat off and failed to place the drive into neutral. As Occupant #1 was trying to put Victim #1 back on the boat, he was put in a position that he contacted the propeller the boat. This action tore his swimsuit off and pulled his left leg into the propeller cutting it. Occupant #5 was not wearing a PFD while the vessel was underway and was warned on this violation.