Ye Xiwen had appeared very suddenly. However, Shou Kun didn't remain idle either. He brandished his long blade, and it immediately produced blade-beams. The space made a loud buzzing sound and trembled. This was a 'dao sound'. Every movement of a divine tool contains the presence of 'dao principles' once it arrives at Great Sage level… just like the experts of Great Sage level. Therefore, that vibration and the buzzing sound contained the traces of dao.
In fact, the experts of Houtian and Xiantian realms would've obtained big profits if they had seen it. Shou Kun had tyrannical cultivation. He contained dao on his person to such an extent that he might become the embodiment of dao and transform his very body into dao.