It is the main style to block the straight punch by fighting at close quarters. The attacker walks in and throws the left punch to the defensive’ face. The defensive steps in hurry by the left foot obliquely to inside (the weight on the left leg).
Pares the punch out by the right arm. Bends the left arm as the angle paralleled to the floor in order to burst the attacker’s rib. If the attacker throws the right punch, the defensive do the same as above in the opposite directions.