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BIFF [to Happy]: The man don’t know who we are! The man is gonna know! [To Willy]: We never told the truth for ten minutes in this house!
HAPPY: We always told the truth!
BIFF [turning on him]: You big blow, are you the assistant buyer? You’re one of the two assistants to the assistant aren’t you?
HAPPY: We’ll I’m practically—
BIFF: You’re practically full of it! We all are! And I’m through with it. [To Willy]: Now hear this Willy, this is me. (Act 2)
Biff desperately struggles to demand truth amidst the chronic deception that his family maintains. He takes a stand against all the lies, leading to tragic consequences.
BIFF, crying, broken: Will you let me go, for Christ’s sake? Will you take that phony dream and burn it before something happens?
[. . .]
WILLY: Oh, Biff! [staring wildly] He cried! Cried to me. [He is chocking with his love, and now cries out his promise.] That boy—that boy is going to be magnificent! (Act 2)
Despite Biff's admission that he is a failure, Willy convinces himself that Biff will still make it big. Willy follows this delusion to his death, killing himself in order to help his son. Does this death bring some sympathy for Willy? Does he die a hero of some sort? Or is it just the logical end to a life of deception?