RedactedNarrative: Vessel 1 was northbound south of Railroad Bridge east of Alberta Creek marina. Vessel 2 two was following Vessel 1. The operator of Vessel 1 let off of the throttle to adjust some clothing. Vessel two struck Vessel 1 on the port side. The operator of Vessel 1 and Vessel 2 drove their PWC's back to the Alberta Creek Marina slips.