INJURED WAS UNHOOKING A BELT TRUST THEY HAD JUST LOADED ON A FLATBED TRUCK TRAILER. HE TRIED TO THROW HOOKS ACROSS THE BELT TRUST. ENDLOADER OPERATOR STARTED BACKING AWAY. ONE OF THE HOOKS HUN G ON TRUST DRAGGING IT OFF THE TRAILER. INJURED MAN WAS ON THE TRUST WHEN IT HIT THE GROUND. HIS LEFT RIB CAGE HIT THE IRON BEAM.