Answer
Radiant Star looked like he wanted to tear Ryu apart for even daring to ask a question, and yet it was already too late. He knew from the start that even if he did return to his true strength, it would have all been useless. How would he stop his wife one way or another?
At least, he couldn't do so without harming her.
Fading Star's aura surged and Ryu felt the Lines of Fate burst apart as though they had been infused with far too much energy.
In that moment, the Laws of the Heavens had been shattered. Nothing worked properly and even the foundation of the world themselves couldn't be brought together. There was no distinction between a Plane and the Void, and life and death were separated by the thinnest of lines until they suddenly overlapped entirely.