RedactedNarrative: Vessel 1 was following Vessel 2 on the lake. Vessel 2 stopped and Vessel 1 didn't stop and its starboard front hit Vessel 2 on the port back side and back of the seat. 
  
  Vessel 2 Operator and Passenger were thrown from the PWC.   Vessel 1 Operator one was thrown off the PWC as well.