As Jem and Scout walk to the pageant at the school, what happens? What literary device is at work here?

Jem and Scout walk past the Radley house on the way to the school, where the pageant and country fair will be held. It's very dark, and they can barely see a few feet ahead of themselves. Cecil Jacobs, a classmate of Scout's runs out to scare them, and definitely succeeds. The literary device in this section would be foreshadowing.