INJUREDS WERE STANDING ON LEDGE GETTING READY TO PARASAIL.  INJURED P1 WAS WEARING HARNESS INJURED P2 WAS STANDING NEXT TO HIM.  GUST OF WIND CAUGHT SAIL KNOCKING BOTH INJURED OFF LEDGE.  INJURED  WAS CAUGHT IN ROPE OF SAIL HIT ROCKS THEN LANDING IN WATER.  BOTH ADMITTED TO HOSPITAL