Zhou Wen was naturally not an unreliable person. He wasn't making such a condition to insult Mohe.
In fact, he had already arrived when Sei Gasakai fought Mohe. Back then, Sei Gasakai had already agreed to Mohe's challenge. It was too late for him to stop it.
Therefore, when Sei Gasakai fought Mohe, Zhou Wen activated the Teacher Domain to observe the extent of Mohe's abilities.
The Teacher Domain was a Calamity Zone derived from the Dao Sutra. The game's introduction was the Domain of Education. Its actual use could block the different nomological powers. At the same time, it could study how the other party's power worked. It could even produce an Essence Energy Art by studying the other party's nomological power.
Zhou Wen originally only wanted to study Mohe's powers, hoping to figure out what kind of power the reflective power was. However, when Zhou Wen used the Teacher Domain to observe it, he made an unexpected discovery.