Why did the author rub Walter Cunningham nose in the dirt?
In my opinion, Scout was bullying Walter Cunningham till Jem came by and stop him. At that time scout had some pleasure when rubbing Walter's nose in the dirt.
Why was Walter's Fist half-cocked?
In my understanding, Walter's fist half-cocked because he was angry. The reasons was because Scout was rubbing his face on the dirt.
Is Scout and Walter enemies with each other?
Do you think it was right for Atticus to go behind the teacher’s back and still read with Scout when the teacher said not to?
In My opinion, what they have done is common in some school, this is because everybody wants to do well in school especially in 'reality'. If they do not do well, parents or teachers will nag and that will not be pleasant.