WORKER STRUCK THE DOOR WITH THE HANDLE END OF A LARGE CRESCENT WRENCH. AFTER STRIKING THE DOOR, THE WRENCH TRAVELED DOWN THE CHUTE FOLLOWING THE ANGLE. UPON REACHING THE BELT, THE WRENCH HANDL E WAS DRAWN UNDER THE CHAIN AND PULLED INWARD. PINNED HIS HAND AGAINST THE GUARD OVER TAIL PULLEY, IT PINCHED AND PULLED OFF ONE HALF OF THE INDEX FINGER, ALSO A THUMB LACERATION.