For the thirty seconds before you have room to do the deeper work properly.
Every tool in this book so far takes real time. Sometimes you need something that works in under thirty seconds: standing in a hallway at a family gathering, right after a last-seen you promised you wouldn't check, or right after the kind of slip Chapter 17 already prepared you for.
Neither replaces the deeper work in Parts Three, Four, and Five. They're the tool for the thirty seconds before you have room to do that work properly.