EMPLOYEE WAS USING AN AIR IMPACT WRENCH & CO-WORKER WAS USING A HAMMER TO REMOVE A BEARING & PIN FROM THE DOG BONE ARM OF THE LOADER. AS CO-WORKER SWUNG THE HAMMER, IT SLIPPED STRIKING THE BRIDGE OF INJURED EE'S NOSE. IT WAS A GLANCING BLOW. IT CAUSED AN ABRASION & SWELLING OF HIS NOSE.