This practice is part of self protection and basic sparring drill. As begin, the opponent attack you by a straight punch, Samantha apply Pak Sao and Elbow Strike Drill at the same time (follow Wing Chun Principle, attack and defense at the same time to achieve the shortest time and biggest impact to defeat opponent) to defeat him.
As image posture is "Bay Zhang" elbow strike and Gum Sao by Samantha, and Steven protected by his Wu Sao.
