RedactedNarrative: Unit 1 was being backed down the ramp at Mile Creek and the rear of the vessel was just at the waters edge.  
  
  Unit 2 was approaching the dock and ramp while towing another vessel.  As Unit 2 went to dock, a passenger stepped off onto the dock to tie the vessel off.  
  
  The line got snagged on Unit 2 and pulled across the operator which pulled him to the rear of the vessel and out of the boat.  During the struggle, the throttle of Unit 2 was engaged causing Unit 2 to collide with Unit 1 and run aground on the boat ramp.