Vessel 1 was traveling West on Twin Lake pulling a skier with a boom on the left side of the boat.  Vessel 1 was coming to the end of the ski runway; the skier let go of the boom and the vessel continued on for approximately 40' before making a sharp left turn.  Victim 1 was sitting in the front of the vessel on the right side when vessel 1 was into it's turn, Victim 1 was thrown over Passenger 1 and into the water.  Victim 1's left arm was hit and amputated by the prop.  The POI was approximately 80' South of the North shoreline of Twin Lake and approximately 60' East of the West shoreline.
Mounds                        