"Intensive Einäscherung..."

Responding to the two-line spell, the flames of the defensive boundary curled like a snake, stretching towards Kariya. To begin with, whether or not this instant-made magus knows the correct principles to counter an offensive spell is itself a subject of doubt.

"I... I'LL KILL YOU... TOKIOMI... ZŌ-KE-N..."

Despite being burned alive, Kariya did not scream; in its place, he merely repeated an endless murmur of curses. With his body been devoured from the inside by worms, it's possible that he no longer had a sense of pain to feel the heat with.

As he writhed with flames enveloping his body, he broke through the fence, stepped over the edge of the roof, and dropped into the darkness of the alley below.

Finally, after cleanly sweeping away all the remaining bugs there with his conflagration, Tokiomi undid his craft and sighed, fixing his collar.

The corpse - will not need a confirmation. Even if there was still breath in him, he would not last long. After this, he only had to wait for the annihilation of Berserker to come naturally from losing his contractor.

- Fate/Zero: Act 10, Part 4

---

Nevertheless, his actions after that, were a complete deviation from his duty,

The instant Tokiomi caused Kariya to fall from the rooftop of the apartment, as if recognizing it as a complete victory, he did not even check his enemy’s corpse. Though half-shocked by his teacher’s audacity, Kirei went to look for Kariya’s body as a follow-up…… When he saw that figure prostrate on the back alley not long after, Kariya was still breathing.

Naturally, if he was the hound of the Tōsaka camp, delivering the final blow swiftly was an obvious duty. In spite of that, the thing going to and from Kirei’s mind then, was the contents of the conversation he had with Archer this morning.

If Kotomine Kirei wants to understand himself, not just Emiya Kiritsugu – no, prioritizing over Kiritsugu, he should observe Matō Kariya’s fate – that was the advice given to him.

Generally, that was an unpleasant conversation. A joke not deserving his time to be listened to.

But still, with Tokiomi and Kariya’s showdown before him, what on earth had caused Kirei to choose the action of standing beside as a spectator? There was no need for him to stay there if he had decided that assistance was unnecessary. Wasn’t it more meaningful for him to seek the other Masters?

And then, the instant the flames Tokiomi created caught Kariya…… The thing which was on his mind, wasn’t it the feeling of dejection?

When he suddenly noticed what he was doing, Kirei had already begun administering first-aid curative magecraft onto Kariya’s body. Carrying Kariya, whose condition had become stable despite in a deep sleep due to his actions, he left the battlefield, and left him in front of the Matō residence whilst stealthily concealing himself from public gaze – That happened about 15 minutes ago.

- Fate/Zero: Act 11, Part 1