If you can

Rui narrowed his eyes as he heard the man respond to his thought while revealing his name. 

It was a shocking conclusion.

One no one could have possibly ever realized.

One surely no one would ever come to know. There were many who had tried, yet they had all failed to grasp the true core of his Martial Art.

Ieyasu had intended for it to remain that way.

Yet, seeing Rui easily discover his greatest secret made him feel trivial. The arrogance that had long developed within him, centered around this secret, began unraveling.

He had run into the one Martial Artist who was capable of learning the truth with just the sheer brilliance of his mind.

Rui stared at him impassively.

The ODA System was a technique that was largely mental. It was not something that could be replicated simultaneously with Rui's first use of it in the battle just by copying his mind.