From my understanding, it should be the text in blue. They aren’t directly related to the text in black.
1 should be: Attacked by the school bully, HIS backpack fell from his shoulder
2: When Amaury slipped on the wet sidewalk, HIS keys slipped out of his pocket
etc.
but I might be wrong :)
<span>David told Laura a secret
</span>
For further questions on to kill a mockingbird I suggest Sparknotes. It’s a site. I looked up your question and found sparknotes. My Answer: I would say the existence of social inequality.