GREY'S ANATOMY - "Crash Into Me, -- Part Two" - In the stunning conclusion of a two-part episode, Meredith furiously works to save the life of a paramedic trapped inside an ambulance, as her sister, Lexie, holds the life of a patient in her hands; Derek must rely on the help of a nurse to save a patient's life, as Bailey struggles to balance her personal life with her work, on "Grey's Anatomy," THURSDAY, DECEMBER 6 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/VIVIAN ZINK) MOE IRVIN, SETH GREEN, CHYLER LEIGH