It is a side quest, the sort you would skip in a video game and feel briefly guilty about. Knov thinks in flowcharts, and this week we get to see a few of the arrows. "That's what happened when Knov-san infiltrated the palace!" someone says, and the room goes quiet for exactly the right reason. Remember "How else could I be attacked by something I can't see or..." from E101? The episode does, and it has an answer. Put the kettle on before it starts; you will not want to get up.