RedactedNarrative: Boat 1 (va2653bh) was not under power and in the process of letting a downed skier back into the vessel. Per lake monticello regulation, passenger on vessel was waving an orange flag indicating there was a downed skier in the water. Skier was on his was to get back into the vessel and his towline was in a horseshoe shape behind him in the water. Boat two (va8719nn) was under power traveling at approximately 15-20 mph. Operator of boat two, upon approach of boat one, noticed the skier in the water and made an evasive maneuver away from the skier missing him by approximately  6-12 feet. Towline from boat one became tangled in the propeller of boat two causing the line to become shortened, wrapping around the skier in the water. The line wrapped around the midsection of skier causing  abrasions to skier's abdomen. While line tightened around skier, he made an effort to untangle himself causing additional lacerations and abrasions to right hand middle and ring fingers. Skier was transported to martha jefferson emergency department by lake monticello rescue squad where he was seen by dr.. No damage to boat one. Minor damage to antiventilation plate of boat two caused by towrope (small chip).