'Shit.'
Ryu could feel what his mother had done immediately. He couldn't even divert his focus to deal with it either. Why would he have any defenses up against his own mother? He was entirely focused on the task at hand and he had no measures to deal with the situation.
It wasn't exactly dangerous, and Ryu had planned on doing something similar himself, but it was difficult to force it like this.
Whenever a Life Destruction was completed, in order for it to be a success, one needed a large amount of resources. These resources, while the body was in a Destruction State, would be absorbed and then used to reconstruct it. Obviously, this energy would likewise be used to strengthen the body.
This process of deconstruction into your smallest parts, followed by reconstruction with a larger amount of energy, was how Body Realm cultivators made the final steps toward the Sky God Realm.
The success of your Life Destruction, then counted on two factors.