INJURED WAS CHANGING OUT TELEPHONE AT #120 SHIELD. A PLASTIC TIE HELD THE PHONE IN PLACE. HE WAS HOLDING THE PLASTIC TIE WITH HIS LEFT HAND AND USING A UTILITY KNIFE IN HIS RIGHT HAND TO CUT T HE TIE. THE TIE TWISTED UNEXPECTEDLY CAUSING HIM TO CUT HIS LEFT HAND BETWEEN THE INDEX FINGER & THUMB.