are you wise enough? try to solve this problem? ready?

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before he went home after a nights duty, the guard told his boss not to go on a plane trip in the afternoon because that night, he dream of a tragedy that will happen.. the plane will crash and no one will survive. the boss postponed his trip. true the plane crashed. so the summond the guard to his office, thank him profusely, gave him bonus and fired him. question: WHY DID HE FIRE THE GUARD WHO SAVED HIS LIFE?