EMPLOYEE HEARD A NOISE AND WENT TO THE OFFSIDE OF THE FEEDER TO INVESTIGATE. HE OBSERVED THE OMEGA COUPLING ASSEMBLY ON THE PICK BREAKER WAS VIBRATING AND HE TURNED TO GO CUT OFF THE FEEDER, WHEN THE COUPLER FLEW APART AND CAME THROUGH THE 1/4"" MESH GUARD, STRIKING THE EMPLOYEE ON THE LEFT LEG CAUSING SEVERE BRUISING AND A BROKEN BONE BELOW THE KNEE CAP.