What literary device starts at the beginning of Chapter 2?

In chapter 2 of S.E. Hinton's Rumblefish Hinton uses the technique of foreshadowing to hint at what is going to happen in the story.

I was hanging out at Benny's, playing pool, when I heard Biff Wilcox was looking to kill me.

This sets the stage for what will happen later. We get the impression that their will be a fight between the two boys. Eventually they do.

The author uses the literary device tone or mood by creating a sense of seriousness. Rusty-James took the threat more serious after talking to Midget.