RedactedNarrative: V1 was returning off the lake and was attempting to back into dock slip at Hibiscus Harbor. Operator was operating the vessel while passenger Subject walked out onto the swim platform to assist in docking. Operator was unaware of Subject's location and stated he was coming in at an angle so he shifted into forward gear. As the boat started forward Subject lost her balance and fell into the water. Once in the water Subject was struck by the dual prop of the vessel. Operator shut off the engine when alerted that Subject had fallen overboard. Subject did have her head above water and did remain conscious and alert while in the water. Medical on scene did have to remove the prop to extricate Subject from the water.