With the respectful Xangs switched back, Drakath knew this would happen as the Chaos energies combine Xing and Xang into Xiang and unleashes their Chaos Beast called the Chaos Harpy.
After The Hero kill the Chaos Harpy, The Hero face Xiang who is having a hard time controlling her good half. The Hero then fight Xiang. When The Hero defeat Xiang, she starts to lose control of her good half again as The Hero knock her down. The Hero then contact Mirror Drakath as he tells Xing, Xang and Xiang that they are free. Xiang's bad side is not going to make The Hero make a choice while Xiang's good side agrees with The Hero. Xiang then gets away.