Both of them could interfere with each other's senses, though it was no easy feat. Aizen's Reiatsu was slightly stronger than Yinsen's, and if Yinsen had not spent a long time preparing while Aizen had no defense against it, he would not have been able to affect Aizen's five senses.
Aizen, meanwhile, found that Kyoka Suigetsu's hypnosis had very little effect on Yinsen, practically none at all. This meant that although they both possessed powerful hypnotic abilities, those abilities were essentially useless in this battle.
"I never expected things to turn out like this."
Aizen truly had not expected Yinsen to be this strong. He was far more difficult to deal with than Aizen had anticipated.
"This is much better than what I originally expected."
His years of hard training had not been in vain. His greatest motivation had been to close the gap between himself and Aizen, even to reverse their positions—he believed that, given enough time, it was not impossible.
Aizen, as a Soul Reaper, had limits. Yinsen did not. As long as he continued training, his strength would keep growing. Therefore, the later their conflict came, the more advantageous it would be for Yinsen.
This direct confrontation had broken out a little early, but it did not really matter. If Aizen could not kill him today, then he would be even less likely to kill him in the future.
It could be said that this was Aizen's last chance, yet Aizen himself did not realize it.
With Kyoka Suigetsu unable to affect either of them, Yinsen and Aizen's battle returned to a simpler, more direct style. Their figures flashed continuously through the small area, while the clash of blades rang out without pause. The occasional flash of Kido merely served as decoration. After a brief test, Aizen