Yani well knew how cruel angels were a lot of the time, not that they were evil, but they are very fair and impartial which can lead to decisions that are considered terribly cruel.
Was Azarphy right to kill them all, as Yani and Naill would explain that they exorcized these holy knights when they were just students who didn't go through the direct blessing of the God of Light?
Furthermore, the lives of those holy knights would be sacrificed after the interrogation, as their souls had been tainted by demonic power which was a heresy, they would lose everything.
They knew this if they were loyal men the church would willingly sacrifice their lives, but if they weren't faithful, they could try to kill Yani and Naill who were their saviors and witnesses in the case of demonic possession.
