Read this extract, and then answer the question that follows it: Bernard: Oh, the hell with the advice, Willy. I couldn't advise you. There's just one thing I've always wanted to ask you. When he was supposed to graduate, and the math teacher flunked him - Willy: Oh, that son-of-a-bitch ruined his life. Bernard: Yeah, but, Willy, all he had to do was to go to summer school and make up that subject. Willy: That's right, that's right. Bernard: Did you tell him not to go to summer school? Willy: Me? I begged him to go. I ordered him to go! Bernard: Then why wouldn't he go? Willy: Why? Why? Bernard, that question has been trailing me like a ghost for the last fifteen years. He flunked the subject, and laid down and died like a hammer hit him! Bernard: Take it easy, kid. Willy: Let me talk to you – I got nobody to talk to. Bernard, Bernard, was it my fault? Y'see? It keeps going around in my mind, maybe I did something to him. I got nothing to give him. Bernard: Don't take it so hard. Willy: Why did he lay down? What is the story there? You were his friend! Bernard: Willy, I remember, it was June, and our grades came out. And he'd flunked math. Willy: That son-of-a-bitch! Bernard: No, it wasn't right then. Biff just got very angry, I remember, and he was ready to enrol in summer school. Willy: [surprised] He was? Bernard: He wasn't beaten by it at all. But then, Willy, he disappeared from the block for almost a month. And I got the idea that he'd gone up to New England to see you. Did he have a talk with you then? [WILLY stares in silence.] Bernard: Willy? Willy: [with a strong edge of resentment in his voice] Yeah, he came to Boston. What about it? Bernard: Well, just that when he came back I'll never forget this, it always mystifies me. Because I'd thought so well of Biff, even though he'd always taken advantage of me. I loved him, Willy, y'know? And he came back after that month and took his sneakers – remember those sneakers with ‘University of Virginia' printed on them? He was so proud of those, wore them every day. And he took them down in the cellar, and burned them up in the furnace. We had a fist fight. It lasted at least half an hour. Just the two of us, punching each other down the cellar, and crying right through it. I've often thought of how strange it was that I knew he'd given up his life. What happened in Boston, Willy? [WILLY looks at him as at an intruder.] Bernard: I just bring it up because you asked me. Willy: [angrily] Nothing. What do you mean, 'What happened?' What's that got to do with anything? Bernard: Well, don't get sore. Willy: What are you trying to do, blame it on me? If a boy lays down is that my fault? Bernard: Now, Willy, don't get – Willy: Well, don't - don't talk to me that way! What does that mean, 'What happened?' In what ways do you think Miller makes this such a dramatic and revealing moment in the play?