EE WAS WALKING BETWEEN THE DRYER AND BURNER ON PLATFORM WALKWAY. HIS LEFT FOOT SLID OFF THE SIDE OF PLATFORM, DROPPING ABOUT 3"", CAUSING HIS LEFT ANKLE TO TURN AND CAUSING HIM TO FALL TO THE GROUND. AT THE TIME HE WAS FALLING, A COWORKER WAS COMING DOWN THE STAIRS AND HELPED HIM UP.