穷寇莫追

Explanation: Tottering foe: the desperate enemy. Do not chase the enemy of nowhere, so desperate enemy counterattack, causing their losses. Also used to refer not Birentaishen. 　　Source: "Sun Zijun war": "Do not force the tottering foe, the military forces of the law also." 　　Examples: Art of War says: "Do teachers go cover, ~." ★ Ming Luo, "Three Kingdoms" Ninety-fifth back