Former mayor Rudy Giuliani was a hero with two associates Thursday, when they saved a man from a dramatic FDR Drive car wreck. Emergency responders, and Giuliani’s worried wife, at first thought Giuliani was in the crash. “There was an accident this morning people thought I was involved in,” Giuliani told Page Six Thursday. He and colleagues Sal DeSalvo and Marc Mukasey were headed north on the Drive from Newark Airport at 8:45 a.m. when “Marc was half-sleeping . . . We took the red-eye [from California]. I was half-sleeping. Sal was driving. He was wide awake when we heard a big...