RedactedNarrative: OPERATOR 1 WAS OPERATING VESSEL 1 WHILE PREPARING TO PULLING FROM A DOCK SLIP. AS OPERATOR 1 WAS PREPARING TO PULL FORWARD THE OPERATOR PUT VESSEL 1 INTO REVERSE. THIS CAUSED VESSEL 1 TO THROTTLE INTO THE BACK OF THE SLIP WITH VESSEL 1. THE COLLISION CAUSED DAMAGE TO VESSEL 1 AND THE DOCK. THERE WAS NO INJURIES FOR THE PASSENGERS ON BOARD VESSEL 1.