ASSOCIATE WAS TAKING FEED BOX TO THE CONVEYOR W/CRANE. THE BOX WAS BEING PUT ON THE GROUND. WHEN CLOSE TO THE GROUND, HE PUT HIS LEFT HAND ON IT TO STEADY THE LANDING. HIS HAND WAS IN THE WRON G PLACE. WHEN BOX LANDED IT SHIFTED. HIS HAND WAS PINNED BETWEEN BOX AND BEAM.