GREY'S ANATOMY- &quot;Here Comes the Flood&quot; - Cristina and&nbsp;Derek check a patient's test results, on &quot;Grey's Anatomy,&quot; THURSDAY, OCTOBER 9 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/ERIC McCANDLESS) SANDRA OH, DANIEL J. TRAVANTI, PATRICK DEMPSEY