Walter Cunningham's jaw muscle twitches because he is ashamed and self conscious about his low income. The teacher is new to Maycomb and is unaware of this economic difference that is present in Maycomb.
Explanation:
Scout explains to the teacher how the society works and why certain last names are based of off their economic level. This is also shown in the way the children act towards each other.
Shakespeare is most likely to use the word arming instead of providing, because the word sounded more tough, it sounded like more protective. Hopefully this helps. Plze mark me brainiest:)
