in fact by Andy's intelligence, if he had not wanted to be put to prison, he should have had other options. He just felt regretful that his wife death was due to their quarrel so he was willing to stay 19 years' imprisonment with innocence, so that his sin in heart can be cleansed; at this time, knowing his innocence, his "student" Tom was murdered by prison warden who had been made use of Andy to wash money. He suddenly thought he could stay no more in the place of trouble--that he was here to expiate sin, how could he forfeit other's life indirectly?