So think about how you show what reality is in your setting so readers pick up early the clues that indicate this event/character is not behaving normally. What are they about to do? Are they the villian or someone just, briefly, getting in the hero/heroine's way?
Can reality be shaped to suit the purposes of those ruling the world? Is there a backlash against that? Even in a magical world there are the rulers and the ruled so what is reality for each of these types? Are the ruled rebelling against the reality imposed on them?