Because he had not prepared in advance this time, the instant Qian turned and saw Danzo, he had no way to immediately cast a genjutsu powerful enough to control him.
And that brief moment gave Danzo his chance.
He judged Qian's intentions almost instantly, then, without the slightest hesitation, revealed one of his trump cards.
He sheathed his sword and formed hand seals, casting Genjutsu: Bringer-of-Darkness Technique in an instant!
This was a visual genjutsu with a learning difficulty as high as Rank A, capable of taking effect at close to mid range.
Its main effect was to seal off the enemy's vision.
From that effect alone, it was not hard to see just how strongly this technique countered the Uchiha clan, who relied on the Sharingan in battle.
In fact, this technique had been created by Hashirama Senju for the purpose of dealing with Uchiha Madara's Sharingan.
And now, Danzo used this technique to deal with Qian.
After guessing that Qian might have awakened the Mangekyō Sharingan, he had specifically sought out this technique as his ultimate hidden card.
For some time now, he had been looking for an opportunity.
Unfortunately, either the timing had been wrong, or his hands had been tied.
Now, he had finally waited until a good chance arrived.
So he used the technique without hesitation.
And Qian was indeed caught by it.
Looking at Qian, who was so close yet whose body had suddenly stiffened, Danzo stepped forward, swung his sword, and chopped straight at Qian's neck.
On the other side, the moment Qian saw Danzo's reaction, he had actually already realized something was wrong.
He had intended to use the reaction time bought by the Mangekyō Sharingan to retreat first.
However, Genjutsu: Bringer-of-Darkness Technique had been created specifically to deal with the Uchiha