RedactedNarrative: Vessel 1 (PWC) following unidentified jetski.  Vessel 1 Operator did not see Vessel 2 on his right that was drifting while picking up waterskiers.  Operator removed hand from the throttle to avoid collision.  Vessel 1 struck the front left of Vessel 2.  Both Vessel 1 Operator and Passenger fell off the boating striking Vessel 2.