GREY'S ANATOMY - &quot;State of Love and Trust&quot; - As Derek begins his role as interim chief, he faces a potential lawsuit when Bailey and Meredith's patient awakens from anesthesia mid-surgery. Meanwhile, Teddy refuses to place Cristina on her service, as Arizona tests Alex out in Pediatrics, and Mark refuses to speak to a heartbroken Lexie, on &quot;Grey's Anatomy,&quot; THURSDAY, FEBRUARY 4 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/ADAM LARKEY)PATRICK DEMPSEY