RedactedNarrative: Unit 2 was moored on the end of a dock at McKinley Marina.  Unit 1 was un-docking and pulling out of his slip, unit 1 put starboard side motor in reverse and port side motor in forward once out of slip to turn boat east.  Unit 1 then attempted to take starboard side motor out of reverse but reverse never disengaged.  Unit 1 then spiraled out of control several times.  Unit 1 operator stated he left the helm to attempt o stop his boat from colliding into unit 2 but eventually unit 1 port side bow collided into unit 2 starboard side beam causing damage to both vessels.  Unit 1 operator stated he then screamed for help and people standing on the dock grabbed unit 1 and pulled it back to his slip.  The passenger of unit 2 stated he was laying in bed watching TV when he felt and heard a big crash which caused him to roll out of bed.