I am guessing that it was not loaded or that he never intended to use it. The guy pulling the machete on him (or some type of very long knife or sword, not my area of expertise) must have sensed that or just feared for his life and used what he had at hand. Fairly short surveillance video here:
VIDEO: See What Happens When Thug Gunman Messes With The Wrong Deli Worker | American Overlook
VIDEO: See What Happens When Thug Gunman Messes With The Wrong Deli Worker | American Overlook