The Setup
We eventually got out of the dungeon and started heading back to the guild. Upon arriving there, I reported the casualties. I simply covered up for Akane and Katrina, saying that there were multiple casualties caused by the monsters down there. Obviously, they took my words since we were in a high-level dungeon and it was normal for low-rank adventurers to die in such an incident.
The day after that, I had to calm Katrina down because she was traumatized after what she did. They were attacked by those adventurers, the ones that I reported saying they were killed by monsters. Akane had no problem killing but Katrina had to be pressured. She couldn't use Stellar at that moment so she resorted to Altima. She gave them many chances to stop but seems that they were either mind-controlled or just stupid idiots. So she had to kill them.