Two PWC's were involved in a collision.  Vessel #1 appeared to be having mechanical throttle/engine issues causing sudden accelleration.  Vessel #2 was approaching to see if Vessel #1 was having diffuculties again and Vessel operator #2 brought himself up alongside when Vessel # 1 suddenly accellerated as if "the throttle was fully pressed"  As this happened the vessel #1 caught and went under the hull of vessel #2 causing the trim guard to strike the victims in the back and right rib area.
Carlsbad                      