GREY'S ANATOMY- "Here Comes the Flood" - Lexie assists with a patient after her photographic memory helps her make the correct diagnosis, on "Grey's Anatomy," THURSDAY, OCTOBER 9 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/ERIC McCANDLESS) PATRICK DEMPSEY, SANDRA OH (BACKGROUND), DANIEL J. TRAVANTI, CHYLER LEIGH