RedactedNarrative: On 7/11/2021, V1 was operating on the North East corner of Lake Poinsett. There were three passengers aboard V1 and one person being towed skiing. O1, was going about 28 mph towing P1 skiing. P1 fell while skiing. When P1 fell, a ski came off and struck P1 in the back of head. P1 was wearing a PFD. O1 picked up P1 up in the boat and immediately had P2 call 911 due to P1 bleeding from the back of the head. V1 landed at Prestrudes lake access on the East side of Lake Poinsett where an ambulance took P1 to Brookings County hospital. P1 was later flown to Sioux Falls for further medical attention. WCO met O1 and P2 at their lake house on the East side of lake Poinsett. O1 agreed to a PBT which resulted in a BAC of .000.