Zhen Congming had set up the array formation very delicately. In order for them to be able to cultivate without external disturbance, he isolated all external sounds. However, if the vibration were strong enough, the people inside the valley would be able to hear it. That was how Xie Yujia heard the loud noise made by Duan Yao's Sky-Turning Stamp
This loud shout showed power and was able to penetrate directly into the array formation. It was obviously not the shout of a Core Formation Realm cultivator.
Hao Ren and the others could hear it clearly in the valley. They were able to imagine how deafening it was for the cultivators outside.
"What should we do?" Zhao Yanzi and Xie Yujia looked at Hao Ren in panic.
They imagined their opponents to be Core Formation Realm cultivators and not Nascent Soul Realm cultivators.
