A 24-year-old uniformed NYPD officer assigned to transit foot patrol in Coney Island shot and killed a man who attacked him with an 11-inch hunting knife when the cop tried to arrest him for attacking a 78-year-old woman on a street below an elevated subway station Thursday, police said. Police Commissioner Bill Bratton said the 58-year-old suspect attacked the elderly woman below the Ocean Parkway Q train station around 1:30 p.m., not long after the woman, a stranger to the suspect, had tried to intervene in a separate dispute the suspect had had with a shop owner in a nearby...