RedactedNarrative: V-2 WAS EASTBOUND AWAY FROM THE MARINA AND STOPPED TO WAIT ON V-1.  V-1 WAS GOING TO ATTEMPT TO SPLASH V-2 BUT GOT TOO CLOSE AND STRUCK V-2.  AOI WAS APPROX. 600 FT. EAST OF THE MARINA WHERE THEY RENTED THE PWCs.  V-1 OVER RODE V-2 AND CAME TO A STOP TO THE EAST OF V-2.  BOTH PWCs WERE TAKEN BACK TO THE MARINA. VESSEL 2 OPERATOR SUFFERED AMPUTATION OF LEFT PINKY FINGER. AREA OF ACCIDENT WAS APPROX 600 FEET EAST OF BEAVERS BEND MARINA AND APPROX 2023 FEET NW OF BROKEN BOW SPILLWAY AND APPROX 8472 FEET NW OF BROKEN BOW DAM.