RedactedNarrative: Vessel #1 was underway and responded to a disabled motorboat due to running out of gas.  The vessel was drifting without an anchor.  The operator of vessel #2 requested a tow to a mooring.  While vessel #1 was towing the disabled vessel it grounded out and came to a complete stop.  Vessel #2 continued its forward motion and hit the stern/transom causing damage to the engines of vessel #1.