Derek decides to quit after learning that more of his patients have died than survived; Izzie‘s interns make an unsettling discovery about "Patient X."

Tonight‘s episode of Grey‘s Anatomy episode begins with Derek (Patrick Dempsey) wallowing in his own misery in the middle of Meredith‘s filthy living room, take-out cartons strewn everywhere around him. He has been avoiding going to work and instead eating all of Alex‘s marshmallow cereal out of the box. He is taking the aneurysm patient‘s death from last episode very hard, especially since her husband is suing him for malpractice. (Remember how he called Derek a murderer?)Meaning, it‘s raining and thundering outside, but if
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