“Kill Yogiri Takatou,” he ordered all of his slaves on standby, ready to put an end to his former classmate.

...

As always, he gave his orders without much thought — but that would end up being a fatal error. His intention of killing now had a concrete action attached to it. As such, that line of killing intent now connected him to Yogiri. But Yuuki himself had no idea he had made such a mistake. In the end, he never once ended up feeling that regret.

...

Killing intent. Yogiri could now see countless, unavoidable lines of black stretching out from the bugs towards him. Acting as one, they seemed to be preparing to jump at him all at once.

“Seems like they’re looking for a good opportunity to kill me.”

“I thought so! I don’t care about stepping on them anymore, please, just kill them! Though with this many of them, I might die either way!”

“Well, I don’t really want them crawling on me either.”

There was no hesitation when he released his power. If he left them as they were, they could gather in even greater numbers and attack him at any time. Even if he detected their killing intent, dealing with them constantly would be too much of a pain. On top of that, the more Yuuki’s control expanded, the less freedom they would have to act. Eventually, their current plan of casually looking for a way back home, or even just reuniting with their classmates, wouldn’t be feasible anymore.

“Die.” Yogiri unleashed his power, but there was no change in the bugs.

“After all this time, now it doesn’t work?!” Tomochika’s last hope of avoiding the insects had failed, leaving her visibly shaken.

“I’m not going to claim that’s impossible, but I’ve certainly never seen it fail before.”

“Then what’s going on?!”

“The situation was just right, so I killed Tachibana.”

“What?!” Tomochika went stiff, his declaration catching her completely off guard.

Yogiri had merely unleashed his power at the true source of the killing intent, Yuuki himself. Suppose someone, somewhere, had the intention of killing Yogiri. That normally wasn’t enough for him to target and kill them. Even if that person had sent their subordinates after him, it wouldn’t change the situation. Yogiri’s power could only detect the people actually carrying out the act.

But in the case of a Dominator, it was different. A Dominator’s power was, at its core, the ability to create a colony. Yuuki was the head, and his slaves were the hands and feet. That was why he could use his subordinates to gather more slaves — those subordinates were like parts of Yuuki’s own body.

But for the same reason, Yuuki’s own killing intent filtered through his slaves and towards Yogiri. All Yogiri had to do was follow that trail back to the source.

“Since Tachibana manipulated the bugs into trying to kill me, I killed him instead.”

-Volume 1 pages 200-201 and 204-205