RedactedNarrative: Vessel was towing a tuber.  Vessel 2 was anchored.  Vessel 1 Operator turned to avoid an oncoming Vessel 3.  As a result of the turn, the tuber swung out and the tuber struck Vessel 2.  Vessel 2 left the area prior to officer's arrival.  Officers were not able to locate Vessel 2, therefore there is no vessel or people entry for Vessel 2.  Vessel 1 operator stated that Vessel 2 was a fiberglass open motorboat that was at anchor.