Ye Ming perceived the Lower World through the Heavenly Dao.
Apparently, the Civil War in the world had erupted badly and even caused some of the Middle World cultivators to inquire about the situation.
Very naturally, Ye Ming had the Heavenly Dao sent them away.
This was his business, so the other cultivators not belonging to Tianwu Country should just scram.
With his overbearing and allowing the Heavenly Dao to kill those who dared to disobey, the other frightened cultivators soon fled far away.
They cleverly understood that if a Heavenly Dao was killing them, it meant that a formidable power was behind the situation.
Only a formidable power could possibly influence the Heavenly Dao somehow. And for there to be no consequences showed that this formidable power could easily erase them completely—both body and soul.
Nobody would want to be killed in such a manner because it meant true death.