Madara suddenly chuckled, then broke into hearty laughter. Even then, his laughter came from every direction, making it impossible to locate him. After a while, it stopped, and he said with satisfaction, "Very good. I really can't use the power of the Mangekyō Sharingan."
At those words, the invisible pressure Kagami Uchiha had felt abruptly vanished. Madara had simulated it with the power of the Mental Image. Until now, that pressure had unconsciously affected Kagami Uchiha's movements, but ultimately, it was psychological. Since he already knew the truth, Madara no longer needed to expend his Mental Image power maintaining it.
"When did you realize?" Madara asked.
"I wondered from the beginning why you weren't using your Mangekyō Sharingan's Dōjutsu. I thought you were deliberately holding back," Kagami Uchiha answered. "But just now, I realized that the pressure remained even with the smoke blocking my vision. The Sharingan's power works primarily through eye contact. Unless the pressure came from chakra, it shouldn't have remained."
"Yes. It was a false impression simulated by Mental Image power," Madara said slowly. "All things are founded on Yin-Yang Release. Yin governs the spiritual energy of imagination and can create form from nothing; Yang governs the physical energy of life and can breathe life into that form. Together, they can give birth to all things. But Mental Image power, which consists only of Yin Release, cannot manifest a true Mangekyō Sharingan."
At this point, he gave a derisive laugh. "That Impure World Reincarnation Tobirama Senju developed, though—it drags a soul back into the world of the living and reconstructs a body from clay. It could just barely meet the conditions for combining Yin and Yang. The soul's Mental Image could also restore some of its kekkei genkai's power. Ultimately, however, the result is still a dead