Ye Mo stood on the top of the World Mountain and circulated half of it. When he saw a huge ditch at the waist of the mountain, he instantly realised.
This was the World Mountain but because a piece of it was dug away, its laws weren't complete. If he wanted to spirit control this World Mountain, he would have to find the piece that was dug away. Not a piece of it can be missing.
How could Ye Mo not realise that the black World Mountain he saw in the truth fall palace was the piece missing.
He would have to find that missing piece but the World Mountain flew away. Where would he find that? Who dug a piece of the World Mountain away.