This video shows Master Wei-Chung Lin, a disciple of the YiZungYue School and the Chief Instructor of the Chinese Taoist Martial Arts Association in Skokie, Illinois, practicing the response (or fixed-step free-form push) hands exercise with students.
YouTube - Response / Push Hands: Exercise After Static Fajin (Fajing) Training in the Pre-Heaven Power Method
YouTube - Response / Push Hands: Exercise After Static Fajin (Fajing) Training in the Pre-Heaven Power Method