VICTIM WAS SITTING ON LAUNCH VEHICLE DECK. AN AIR LINE BLEW APART AT THE CABLE REEL ON THE UP-PER PLATFORM. IT STARTLED HIM AND HE JUMPED OFF THE LAUNCH VEHICLE. HIS LEFT FOOT LANDED ON A ROCK ON THE PIT FLOOR AND CAUSED HIM TO SLIP. BOTH BONES IN THE LEFT LEG WERE BROKEN AT APPROXIMATELY THE TOP OF HIS BOOT.