EMPLOYEE WAS HELPING MAKE A (NAIL TYPE) SPLICE IN THE BELTLINE. ANOTHER EMPLOYEE WAS USING A HAMMER DRIVING THE SPLICE TOOL (WHICH DRIVES A SET OF 5 NAILS INTO THE BELT). EE REACHED OUT TO MOVE THE TOOL & THE OTHER EE HIT HIS FINGER WITH THE HAMMER. THIS CAUSED A FRACTURE TO HIS INDEX FINGER ON HIS RT. HAND.