Fair Duel

Cultivators were always unrestrained by the laws that used to bind mortals. 

After all, cultivators were people who went against heaven to cultivate.

How could mortal laws ever bind them? 

The only reason why it ever does is when a more powerful cultivator wishes to punish a weaker cultivator. And what better way to do so than to yap a few mortal laws of their crimes? 

Of course, that kind of stuff rarely happened once a cultivator reached a higher cultivation realm. This was especially so when their clan was the greatest and strongest ever. 

Therefore, Ye Ming's action of using the law to judge his fellow clan mates was a complete and utter shock. None of them expected that was his objective from his return. 

As for Binghe's sudden request for a fair duel—it was the most common resolution for cultivators.

Survival of the strongest, but in a fair duel, both cultivators would be restricted in the same cultivation realm.