RedactedNarrative: Skier lost footing while tending a ski rope and fell. During descent to water, subject's right hand middle finger became lodged in outboard engine hood vent, severing the distal phalange of same upon entry into water. Subject returned to vessel and self transported approx. 2.4 miles to local marina to seek medical aid. Subject and severed digit transported via ambulance to area hospital for further attention.