Nie Yun had long known Ouyang Cheng was following him because of the Tracking Qi, but he didn't call him out. Upon seeing the Ancient Corpse, he deliberately pretended to reach for it, luring Ouyang Cheng to make the first move.
'The Demon Saint was a Heaven-Seizing Creation Secret Realm Powerhouse. Even in death, how could his body possibly tolerate being casually defiled? I didn't even have to think to know it must have some kind of hidden defense mechanism!'
It was because he had considered this that Nie Yun let Ouyang Cheng make a move, allowing him to "enjoy" the contingency the Demon Saint had left behind.
Sure enough, stimulated by a jab from Nie Yun's finger, the Demon Saint Ancient Corpse activated, rising to its feet and throwing a punch.
