Aunt Alexandra entered the room as Atticus was saying, “We don’t have anything to fear from Bob Ewell, he got it all out of his system that morning.”
“I wouldn’t be so sure of that, Atticus,” she said. “His kind’d do anything to pay off a grudge. You know how those people are.”
– Harper Lee
To Kill a Mockingbird, Chapter 23. Aunt Alexandra has a foreboding response to Atticus’s dismissal of Bob Ewell’s threat to pay him back. And she turns out to be right.