RedactedNarrative: V1 operator stated they were boating on Greer's Ferry when V1 quit running.  An unknown female operating a rental pontoon boat (V2) stopped, offered assistance and ended up towing V1.  All occupants of V1 except the operator boarded the pontoon boat.  V1 Operator believes the operator of V2 was inexperienced in towing because he felt like his vessel was being towed too fast.  He told the operator to slow down and at that V2 operator caused V2 to come to a quick stop, causing water to come over the stern of V1 sinking it.  V1 operator swam to V2 and boarded it.  
   
  V1 operator reported the accident but V2 and it's operator left the scene.  This officer visited every rental facility on the lake and spoke with all the renters who came in that day or had rented boats and none of them admitted to assisting a disabled vessel.  Therefore there isn't any information on V2 or it's operator - unknown at this time.