Bruno and shmuel are the protagonists because they are mostly mentioned in the story
The meaning of "Jem had no firm basis for his ideas, he said it was merely a twitch." in chapter 8 in TKAM is that Jem just said what he said as a spur of the moment without a solid plan.
<h3>What happened in
To Kill a Mockingbird?</h3>
This refers to the story that occurred in a very racist town when a lawyer Tom Sawyer decided to defend a black man accused of a crime and his family began to be attacked by his decision to defend the black man.
Hence, it can be seen that Jem was his child and did not have any firm basis for the idea which he said, but they just came out of his mouth, and was so scared the next day.
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They can learn all the different traits of a character
The man in the jail house tried to kill or find trouble for Tom Robinson. Luckily Atticus was there and Jem had the idea of following his father because he was worried. Scout later then solved the issue by mentioning Mr Cunningham's trail (or some sort I forgot) and they all realised that Atticus is just trying to do his job and justify the person like how he treats them. At last they went back and Tom wasn't harmed.