Bill O’Reilly, who was a young foreign correspondent for CBS News, has invaluable advice for any journalist caught by unfriendlies in war zones. “Never get down on your knees and beg,” the Fox News star recently told a talk-show audience on Hamptons cable channel WVVH. “The moment you show any weakness, you will be killed. Always look your enemies in the eyes and ask them politely, but firmly, to release you.” This tactic, taught to him by a Jesuit priest in Central America, saved his life twice — once in Argentina and once in El Salvador — O’Reilly told Ingrid Lemme on her “American Dream” show taped at Gurney’s Inn in Montauk. O’Reilly also had the audience enthralled with stories of his childhood in Levittown and praised President Obama as one of the toughest and best-prepared subjects he had ever interviewed.