After completely mastering the 'Restraining breath technique', now, even if he stood next to a master of the peak Houtian ninth stage, his breath would not be discovered. And so long as he was careful enough, he had full confidence to pull a fast one on a Xiantian master.
Ye Xiwen also discovered that the utility of 'Restraining breath technique' was far more than just restraining the breath. It could even change the breath of the practitioner completely into another person's breath, which was very rare. (NT: This technique could manipulate the cultivation level)