THE EMPLOYEE WAS WALKING ON ROCK OUTCROP. HIS LEFT FOOT SLIPPED, CAUSING HIM TO FALL. HE THREW HIS RIGHT LEG OUT TO THE LEFT TO PREVENT FALLING. UPON IMPACT HIS RIGHT FOOT CONTACTED MORE ROCK, CAUSING HIS FOOT TO BEND BADLY AT ANKLE. HE WAS TRANSPORTED TO THE E.R. FOR TREATMENT AND EVALUATION. HE WAS DIAGNOSED WITH A FRACTURED ANKLE.