Xie Yu commands the city guard barracks to guard the mansion, so that Prince Yu's army cannot easily save the guests. The Zhuo family, Jingrui, Princess Yuwen Nian, Yujin, Mei Changsu, Fei Liu, Meng Zhi, Xia Dong, Yue Xiuze and Gong Yu escape through a trap door and flee to the manors back gardens. Right when Xie Yu commands the guard barracks to release arrows at the guests, Liyang arrives to stop Xie Yu and let Prince Yu's army into the manor. When the manor is seized, Liyang makes Prince Yu swear that he must never implicate the Zhuo family. (Source: Wikipedia)