EE WAS PLACING 55# BAGS OF REFRACTORY MIX ON THE BAG CUTTER OF THE MORTAR MIXER TO BREAK THEM OPEN AND DISCHARGE THE CONTENTS INTO THE MIXER. WHEN HE DROPS THE BAG ONTO THE CUTTER IT RIPS A HO LE IN THE BAG AND THEN EE THRUSTS ONE END OF THEAWAY AND THE OTHER END TOWARDS HIMSELF CAUSING A COMPLETE TEAR OF THE BAG. HE ALLEGES THAT WHEN HE DID THIS HE FELT HIS SHOULDER POP & FELT PAI