Who puts the blanket over scouts shoulder and how does Attic's reach this conclusion?

In "To Kill a Mockingbird," Boo Radley puts the blanket over Scout's shoulders during the fire at Miss Maudie's house. This conclusion is reached by Atticus when he notices Scout wearing the blanket and deduces that it must have been Boo who quietly came to her aid without her realizing it. This moment illustrates Boo's protective nature and serves as a turning point in the children's understanding of him.