Gongshu Chou opens a door on the ground and says someone has to swim in the underground river to the Waterfall and turn on one of the Four Holy Creatures, Xuanwu (the Black Turtle) to bring in clean water or they will all die. He tells Tianming to rotate on the red handle, but when Tianming makes it to the Machine Creature, he realizes something wrong with Gongshu and rotates the black one. Clean water is brought in but Tianmign is attacked by the Black Turtle. Mohists realizes Wei Zhuang has set a trap for their approaching allies and sends Daozhi to warn them. Wei Zhuang sends Baifeng to chase him.
听了公输仇的话，天明为了解救众人，决定下水打开玄武水阀，按照公输仇的嘱咐，天明屏息游向玄武水阀，而在牢室的高月发现了公输仇的身份，处境变得危险起来。玄武水阀被天明打开，机关城注入了纯净的水源，与此同时，班大师突然醒悟到卫庄的真正意图，为了阻止他的阴谋得逞，盗跖以神行术突破重围，离开了中央大厅。
