<Tr> <Td_colspan="7"> Bailey orchestrates a massive 12 - person simultaneous "domino" surgery with six separate kidney transplants . Alex and Izzie share a kiss, Callie sleeps with Mark and a rift comes between Meredith and Derek when their clinical trial is published and called the Shepherd method with no inclusion of Meredith . </Td> </Tr> <Tr> <Th> 84 </Th> <Td> 6 </Td> <Td> "Life During Wartime" </Td> <Td> James Frawley </Td> <Td> Mark Wilding </Td> <Td> October 30, 2008 (2008 - 10 - 30) </Td> <Td> 15.05 </Td> </Tr> <Tr> <Td_colspan="7"> Dr. Owen Hunt returns to Seattle Grace, being named as the new Head of Trauma Surgery - all part of the Chief's effort to raise the #12 ranking, and it works, raising Seattle Grace back to a Level I Trauma Center . Hunt uses his unorthodox treatment and teaching methods, rubbing Izzie, Derek, Mark and Cristina the wrong way . In keeping with his spirit of raising the #12 rank, the Chief has Bailey and Hahn perform tumor resection deemed impossible by many other hospitals . Callie tries to find out who she really is . </Td> </Tr> <Tr> <Th> 85 </Th> <Td> 7 </Td> <Td> "Rise Up" </Td> <Td> Joanna Kerns </Td> <Td> William Harper </Td> <Td> November 6, 2008 (2008 - 11 - 06) </Td> <Td> 15.63 </Td> </Tr>

Why are meredith and cristina fighting in season 5