That was right—Ryusuke had used the Phantom Body Flicker Technique.
Ever since obtaining Lightning Blade: Kiba, Ryusuke had been using the ninja blade to train in Lightning Release Nature Transformation.
After more than a month of tinkering, he had finally mastered the Lightning Release Chakra Stimulation Technique. His speed was no slower than Rock Lee without his weights.
At first, Ryusuke had only wanted to improve his speed.
That was until one day, during a No-Rules Duel between his Shadow Clone and Karin. Watching the clone toy with Karin using the Red Eye Illusion and Body Flicker Technique, Ryusuke suddenly had an idea and thought of Uchiha Shisui's Phantom Body Flicker Technique.
In Ryusuke's eyes, in a one-on-one fight, this technique was absolutely no weaker than the Flying Thunder God Technique or Kamui intangibility.
However, training in this technique required formidable mastery of genjutsu and Body Flicker Technique.
Especially genjutsu—it had to be the kind that could be cast without hand seals.
After mastering the Lightning Release Chakra Stimulation Technique, Ryusuke now met the requirements to train in this technique.
His Sharingan genjutsu mastery was still inferior to Uchiha Shisui's, and he could not yet create phantom clones that would not disperse.
But even without relying on Sharingan genjutsu, Ryusuke could create phantom clones that would not disperse.
The first was the Red Eye Illusion, and the second was the Hell Viewing Technique he had learned from Yuhi Kurenai.
Both of these clones were genjutsu clones!
Even the Byakugan could not see through the former, while the latter could be enhanced with the Sharingan.
Moreover, these two genjutsu clones could be combined.
When Ryusuke tried it, he found that it really worked.
So, Ryusuke began developing the Phantom Body Flicker Technique using the Red Eye Illusion and the Hell Viewing