RedactedNarrative: UNIT 1 WAS RETURNING TO THE DOCK AT APPROXIMATELY 2030.  THE OPERATOR OF UNIT 1 WAS LOOKING DOWN AT HIS PHONE WHEN UNIT 1 STRUCK THE AFT STARBOARD ALUMINUM RAILING OF UNIT 2 THAT WAS TIED TO THE DOCK.  THE OWNER OF UNIT 2 SAW THE COLLISION ABOUT TO OCCUR AND YELLED OUT AT UNIT 1 TO ALERT HIM.