HE WAS REMOVING A HOSE BAND ON A 3"" RUBBER HOSE. THE HOSE HAD FACTORY INSTALLED FASTENERS THAT HAVE TO BE REMOVED BY SAWING OFF. HE WAS SAWING THROUGH THE HOSEBAND WITH A HACKSAW. WHEN HE CUT THROUGH, THE FASTENER POPPED BACK AND CUT HIS LEFT INDEX FINGER.