Answer and Explanation:
Jem says that if you keep a match burning on top of a turtle, it will come out of the shell to avoid danger. This promotes a parallel with people who are led to do what they do not want, as these people need a risk situation to be established and involve them, so that they do what they do not want, as well as the turtle, who for fear of the fire, get out of the shell.
A real example that can be associated with this is when people expect to get too sick to seek medical attention, when they could have sought care when they first felt the symptoms of the disease, but they didn't want to.