A LARGE PIECE OF ROOF ROCK WAS LOADED ONTO THE UNAHAULER DURING THE MINING CYCLE AND WENT DOWN BEHIND THE RAM OF UNAHAULER, PREVENTING THE RAM FROM RETRACTING. THE FOREMAN GOT UP IN THE HAULE R AND ATTEMPTED TO MOVE THE ROCK OUT FROM BEHIND THE RAM. THE ROCK SLID AND CAUGHT HIS FOOT BETWEEN THE RAM AND ROCK.