If an act of stopping an unlawful infringement is taken in order to protect the state, public interests, the person, property and other legitimate rights of himself or others from ongoing unlawful infringement and causes damage to the unlawful infringer, it belongs to justifiable defense and shall not bear criminal responsibility. If justifiable defense obviously causes major damage beyond the necessary limit, he shall bear criminal responsibility, but shall be mitigated or exempted from punishment.
According to the above definition, Which of the following is typical justifiable defense?
A and B fought each other, B saw that he was weak and ran away, A was chasing after him, B reluctantly picked up a stick again, and wounded him while he was unsteady on his feet