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While the job candidates try to diagnose a magician whose heart failed during an underwater-escape act, House is determined to prove that he's a scam artist who's faking to cover up his embarrassment over nearly drowning during his act. Meanwhile, House suspects that one of the candidates has an undisclosed illness. He also pits them against one another in a challenge involving Cuddy, with the winner getting the chance to nominate two other candidates for firing.