A ball hitting the side wall first will take you further back, while a ball hitting the back wall first will take you more forward.
This offers a really useful mental model for playing balls off the back and side walls. The coach simplifies the key principle: how hitting the side wall first versus the back wall first affects your positioning. Mastering this understanding of the rebound is fundamental to comfortable and effective play from the back of the court. It helps you move correctly to prepare for the shot.