RedactedNarrative: Vessel one, identified as a 1976 Pacemaker, was attempting to dock in a reverse motion of travel.  The rear of vessel one struck the bow of vessel two, (docked) identified as a 1980 Torres.  
  
  Through the transfer of energy, vessel two was pushed into and struck a dock.    Operator1 advised, he was attempting to dock the vessel into the slip at the D Dock.  While docking the vessel, Operator1 was facing the aft and operating the controls behind his back.  Operator1 then increased the throttle while in reverse, thinking he was operating the transmission shifters.  At this time, vessel one collided with vessel two.