It's up to King Zheng to convince the people of Zui to fight, defending Xianyang and Qin itself. Li Mu's arrival makes them second-guess themselves.
In other words, Zui is the last castle
capable of stopping the enemy army.
Zui ist somit das letzte Bollwerk,
das die feindliche Armee abwehren kann.
En otras palabras,
Zui es el último castillo
Ou seja, Zui é o último castelo
capaz de parar o exército inimigo.