Why did the boy not run away when the woman finally let go of his neck?

Immediately after Roger attempts to steal Mrs. Luella Bates Washington Jones's pocketbook, she grabs him by the neck and proceeds to drag him home in order to prevent him from running away. While Mrs. Jones drags Roger to her home, she asks Roger if he has washed his face or eaten dinner this evening. Mrs. Jones's questions reveal that she is a concerned adult and is not particularly interested in punishing the boy. Roger must be feeling shocked that the woman is more concerned about his well-being than she is about informing the authorities regarding his attempted robbery. It is only after Mrs. Jones drags Roger into her home that she lets go of his neck. Once she lets go of Roger, she instructs him to head to the sink and wash his face. After briefly looking at the door and contemplating running away, Roger decides to walk to the sink and wash his face.
While Hughes does not explicitly reveal why Roger decides not to run away after Mrs. Jones lets him go, one could surmise that Roger felt like Mrs. Jones was a sympathetic woman who was primarily concerned about making sure he was washed and fed. Overall, Roger does not view Mrs. Jones as a threatening person who would inform the authorities about his attempted robbery; instead, she is a concerned, motherly woman who is unusually forgiving. Roger trusts that Mrs. Jones actually wants to clean and feed him, which is why he does not run away. He feels comfortable knowing that she is a sympathetic woman with good intentions, which is why he stays to eat.

Roger attempts to steal the purse of Mrs. Luella Washington Bates Jones. His plan fails, and he ends up on his back on the sidewalk. Mrs. Jones snatches him up and proceeds to teach him a lesson. She asks Roger if he plans to run if she lets him go. He confirms that he will run, so she continues to hold him. When she reaches her home, she finally lets him go and tells him to go wash his face.
The author does not specifically state why Roger does not run when Mrs. Jones lets go of his neck. However, one can speculate that he does not run, because he does not want to be seen as untrustworthy. Evidence in the text seems to support this reason. When she discovers that Roger has not eaten supper, she states that perhaps that it is the reason he tried to steal her purse. Roger is honest with her and tells her he wants a pair of "blue suede shoes." When Mrs. Jones goes to prepare supper, Roger again has an opportunity to run. She even leaves her purse where Roger can see it. However, Roger stays where she can see him because he "did not trust the woman not to trust him. And he did not want to be mistrusted now." Perhaps it is because Roger has been given an opportunity to be trusted that he remains trustworthy.