As representatives of 'Order' on a certain level, devils have extremely strict codes of conduct and rules in order to ensure the smooth operation of the Nine Prisons.
The City of Dis is no exception.
Here, whether it's fraud, trickery, murder, or assassination, everything must be done according to basic rules and procedures; robbery and violence on the streets are absolutely not allowed and will result in severe punishment. Only brainless demons would act recklessly.
Since it's not allowed on the street, what about killing in a secret room? Bartlett didn't know. Anyway, he had been a prisoner for a long time, eating and sleeping in a cage as a gladiator for entertainment, at worst having to fight a few more battles.
