Talk about fearless. After an armed robber fired a shot at a Long Island deli worker, the man behind the counter grabbed a machete and chased the thief out of his store. The surveillance video from late last month shows a robber bursting into the Brentwood deli, pointing a semiautomatic at the clerk's head and demanding cash. When the worker hesitates, he fires a round that hits the back wall, prompting the man to grab a legal machete. The deli owner says the worker was her nephew and he at first thought the gun was fake.