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"Do it," he hears the hunter say. "Just do it!" comes a moment later.
Ah. Now Castiel understands. Dean defiantly demands his own death. As if the man at his feet were in a position to demand anything.
And by all rights Castiel should give Dean his wish. He should end Dean Winchester's life now, should have done it long before this point; if not for Dean's traitorous course then certainly given the human's absolute insolence and inexcusable and continuous lack of respect.