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The Chorus Leader's speech is an example of Foreshadowing

foreshadowing - be a warning or indication of (a future event).  

The Chorus Leader’s speech is an example of  foreshadowing.

Foreshadowing is a literary device used by a  writer to give an advance hint of what is next in the story. Foreshadowing often is found at the beginning of a story, or a chapter, and it helps the reader develop expectations about the following events.

A writer may implement foreshadowing through character dialogues, plot events, and changes in setting.