RedactedNarrative: Vessel 2 was docked at restaurant with one person onboard.  Vessel 1 was approaching dock.  Operator of vessel 1 was pulling lines out of compartment and asked passenger to grab handle bars in the mean time.  
  
  Passenger on board grabbed the throttle when she reached for the handle bars causing the vessel to collide with dock and vessel 2.    
  
  Operator of vessel 1 suffered a significant head injury.  The passenger on vessel 1 and the operator on vessel 2 both sustained serious but not life threatening cuts and abrasions.