Within the confines of her ham costume, Scout was still able to identify a fourth person struggling in the dark with Jem and their attacker. She certainly had no clue who it could have been, at first thinking it was Jem battling the man; and then assuming it was Atticus who had come to help. But when Sheriff Tate asked Scout who it was, she suddenly pointed to a man standing in the corner with his back against the wall. After surveying him from top to bottom, with his white hands, sickly complexion, and hollow cheeks, she immediately knew it could only have been her never-before-seen neighbor, Boo.
Scout and Jem had long since gotten over their fear of Boo. They knew he had given them the gifts in the knothole, and the children knew they were acts of kindness; likewise, Jem's mended pants and the blanket with which Boo covered Scout's shoulders on the night of Miss Maudie's fire had shown that he meant no harm. Now, Scout realized that it was Boo who had come to their rescue, and her dream of seeing him in person had come true in a most miraculous way.
Scout politely led "Mr. Arthur" to a rocking chair in the shadows of the porch, and, "feeling slightly unreal," she sat down beside him. After Sheriff Tate left, she invited him to say goodbye to Jem, taking his hand and leading him to the bed. She suggested that Boo "pet him," and Mr. Arthur touched the boy's head. Then, like the lady that Scout was slowly becoming, she "slipped my hand into the crook of his arm," and escorted Arthur back to his home.