Magnus told me that it was the killing of demons, so I vote for Tieru's execution based on his signature (antonyms), and if he was also involved in the first murder (where the murderer flew into the sky), then his unit with an angel flying into the sky might fit here.
Небо – угроз не слышит
Небо – ведёт особый счёт
Небо – тебя найдёт