RedactedNarrative: VESSEL NUMBER ONE (V1) WAS RIDING NEXT TO VESSEL TWO (V2) EAST FROM THE CALIFORNIA SHORE TOWARD THE CHANNEL IN THE NORTH BASIN.  V-1 ACCELERATED AHEAD OF V-2 AND ANOTHER PERSONAL WATER CRAFT (PWC).  V-1 ABRUPTLY TURNED RIGHT CAUSING HIMSELF TO BE EJECTED FROM THE WATERCRAFT.  V-2 DID NOT SEE THE OPERATOR IN THE WATER AND STRUCK HIM WITH THE BOW OF  HIS JETSKI IN THE HEAD CAUSING A SCULL FRACTURE.  THE OPERATOR OF V-1 WAS TRANSPORTED TO SITE SIX ON A FOURTH VESSEL FOR MEDICAL AID