Scout tells them that they are all friends and their is no reason for a mob.
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Scout stops the second mob in town by pretending to be a lost child and confronting the leader of the mob, Mr. Cunningham, by referring to him as a friend of Atticus. This personal connection and reminder of their shared humanity causes Mr. Cunningham to disband the mob and leave.
The children, Scout and Jem, intervened and approached the mob at the jail where Atticus was guarding Tom Robinson. Scout's innocent conversation with Mr. Cunningham, one of the mob members, and her recognition of other men in the mob led them to disperse and retreat. Her presence humanized the situation and prevented any violence from occurring.
Scout intervenes in the mob that surrounds Atticus outside the jail in "To Kill a Mockingbird" in Chapter 15. She recognizes Mr. Cunningham and engages him in conversation, reminding him of his humanity and leading to the dispersal of the mob.
In "To Kill a Mockingbird," Scout unknowingly diffuses the tension during the mob scene at the jail by recognizing Mr. Cunningham and engaging him in conversation about his son, Walter. This interaction with Scout reminds Mr. Cunningham of his humanity and the respect he has for Atticus. This ultimately leads him to disperse the mob and prevent any harm to Atticus.
Yes, Atticus was in real danger during the confrontation at the jail with the mob. Scout's presence helped humanize the mob, causing Mr. Cunningham to reconsider his actions and eventually disperse the group. Without Scout's intervention, the situation could have escalated and resulted in harm to Atticus.
Jem didn't do anything, he just brought scout to the jail while the mob was there. Scout showed the mob that Atticus helps everyone. The mob wanted Tom Robinson, but they would have to go through Atticus (hurting him in the process most likely) to get to Tom. If Jem didn't bring Scout, Atticus would have been injured in some way.
Atticus remains calm and composed when Scout runs to him at the jail, despite the tense situation with the mob. He is relieved to see her but also tries to protect her by keeping her away from the dangerous situation unfolding.
Atticus explains the concept of a mob to his children by describing it as a group of people who act emotionally and without thinking rationally. He emphasizes the importance of maintaining one's individual conscience and not succumbing to group mentality. Atticus uses this example to teach Scout and Jem about standing up for what is right, even when others around you are behaving unjustly.
Scout had courage when she was visiting Atticus late at night and witnessed the mob coming to (presumptively) hurt his client. She talked to the angry men and distracted them, ultimately calming them down.
Mr. Underwood does with a shotgun, vthen Scout, Jem and Dill arrive.
In "To Kill a Mockingbird," Atticus Finch guards Tom Robinson at the Maycomb jail, trying to protect him from a potential lynching by a mob. Scout, Jem, and Dill arrive to find Atticus alone facing the mob. Scout's innocent presence, along with her conversation with Walter Cunningham Sr., ultimately shames the mob into dispersing and abandoning their plan.