Scout tells Sheriff Tate and her father what happened, then notices a strange man behind Jem's bedroom door. Atticus introduces Scout to Arthur Radley, whom she knows as Boo. It was Boo who rescued Jem and Scout, overpowering Bob Ewell and carrying Jem home. The sheriff reports that Ewell, apparently seeking revenge for Atticus humiliating him in court, is dead at the scene of the attack. Atticus mistakenly assumes Jem killed Ewell in self-defense, but Sheriff Tate realizes the truth – Boo killed Ewell defending the children. His official report will state that Ewell died falling on his knife. He refuses to drag the painfully shy, introverted Boo into the spotlight for his heroism, insisting it would be a sin. As Scout escorts Boo home, she draws a startlingly precocious analogy: comparing the unwelcome public attention that would have been heaped on Boo, with the killing of a mockingbird that does nothing but sing.