RedactedNarrative: UNIT 1, 2 AND THE WITNESS WERE ALL RIDING TOGETHER IN A GROUP. UNIT 2 WAS LEADING THE GROUP AND HAD COME TO A STOP USING HIS IBR SYSTEM ON HIS SEADOO PWC. THE OPERATOR OF UNIT 1 STATED THAT HE HAD LOOKED BACK AND THE 3RD PWC IN THEIR GROUP AND HAD NOT SEEN THAT UNIT 2 HAD COME TO A STOP. THE OPERATOR OF UNIT 1 STATED THAT HE ATTEMPTED TO MANEUVER HIS PWC TO AVOID STRIKING UNIT 2 BUT WAS UNSUCCESSFUL IN AVOIDING THE COLLISION. UNIT 1 RAMPED UNIT 2 CAUSING THE OCCUPANTS OF BOTH UNIT 1 AND UNIT 2 TO BE EJECTED FROM THEIR RESPECTIVE PWC. THE OPERATOR OF UNIT 1 STATED THAT HE WAS TRAVELING IN EXCESS OF 20 MILES PER HOUR AT THE TIME OF THE COLLISION. THE OCCUPANTS OF UNIT 1 WERE NOT INJURED. THE OPERATOR OF UNIT 2 WAS INJURED AS A RESULT OF THE COLLISION AND THE PASSENGER WAS SEVERELY INJURED AS A RESULT OF THE COLLISION AND WAS TRANSPORTED TO AN AREA TRAUMA HOSPITAL BY AN HELICOPTER.