A horse that has made a positive change in his behavior needs an opportunity to 'soak', to concentrate on & digest what he has learned. He needs his quiet time. Given this opportunity, his response will be better the next time you work with him.
Buck Brannaman (2003). “Faraway Horses: The Adventures and Wisdom of One of America's Most Renowned Horsemen”, p.125, Rowman & Littlefield