Rules
If the woman could hear Ryu's thoughts, maybe her already crumbling Dao would completely collapse. How could a Dominion with such momentum still possibly feel incomplete? However, that was exactly how Ryu felt.
This Dominion that Ryu had comprehended was quite special and he also felt as much. But, the requirements and restrictions on it were too great. The woman was right to feel that this wasn't something Ryu could easily replicate. Whether it was the assassin Sky God or her, they were very special circumstances that required just the right conditions.
However, what Ryu wanted wasn't something he had to scheme and dodge about to use. Though he could do so, it wasn't his style and he didn't like it.