THE EE WAS CLIMBING DOWN OFF OF THE TRACKHOE. WHEN THE EE PUT HIS FOOT DOWN HE THOUGHT HE WAS STEPPING DOWN ON SOLID GROUND. BUT THE GROUND WAS EXTREMELY SOFT. WHEN THE EE STEPPED DOWN INT HE MUD, HIS FOOT SANKED IN THE MUD AND HIS FOOT TURNED TO THE SIDE. THIS CAUSED HIM TO BE OFF BALANCE AND TO PUT TOTAL WEIGHT ON ANKLE.