Not only is Bob Ewell’s creepy presence enough to make many people careful around him, he also makes some threats after the trial. He is heard saying, “One down, two to go,” when he learns of Tom’s death; this implies that now that Tom Robinson is out of the way, he will go after two more people. As readers, we assume that he will carry out some vengeance against Atticus, Heck Tate, or Judge Taylor because of how they disgraced him during the trial. However, Atticus, Heck, and the Judge are powerful men, and if we know anything about Bob Ewell, we know that he is a coward who preys on the weak. He abuses his children and blames others for his misfortunes. Atticus does seem to be somewhat alarmed enough by Bob Ewell and the sentiment of many in the community that he asks Aunt Alexandra to come stay with the children during the trial.
After the trial, Bob Ewell also threatens Helen Robinson by stalking her and cussing at her. In addition, he tries to break into Judge Taylor’s back door one night, and he spits in Atticus’ face.
In the end, we know that the “two” he was after were Scout and Jem. Bob Ewell is not man enough to confront Atticus and instead seeks revenge against Atticus through his weak and innocent children.
Bob Ewell was actually pretty careful not to make specific threats in To Kill a Mockingbird. Although his intentions were obviously hateful, Bob was somewhat discreet when it came to publicly announcing them.
- Shortly after the trial, Bob met up with Atticus and spit in his face. According to Miss Stephanie, "Mr. Ewell approached him, cursed him, spat on him and threatened to kill him."
- After Bob lost his WPA job, he "openly accused Atticus of getting his job," although there was no specific threat uttered.
- Bob later harrassed Helen Robinson, "crooning foul words" at her as he followed her down the road.
I agree with bullgatortail and also another is when Bob tries to burgle Judge Taylor.