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This week, a structural collapse at a sci-fi convention overwhelms the short-staffed ER, Abby and Luka share an intimate moment, Corday guides Mark through a delicate procedure, Frank tries to get some patients arrested, Malucci won't leave Chen alone, Benton has a huge surprise waiting for him at the hospital, and Carter\u2019s return to the ER isn\u2019t quite what he\u2019d hoped for.