Foreshadowing is a literary device in which the author gives the reader a hint of what is going to happen later in the story. This is done in order to create anticipation and suspense. In this case, if the author were to show the magician enjoying the fact that the audience is scared, the reader would be able to guess that the magician does not care about the audience enjoying themselves. This would hint at the fact that the magician would become bad later in the story.
