It is also public knowledge that while Baal likes to half his superiors into fighting him, he doesn't accept any challenge from those beneath him. He won't fall into being goaded. He will only fight if they use their challenge quota on him. Dukes have to respect their superiors and cannot say anything overly offensive to each other even to goad them into a fight. The hierarchy of the family is strictly upheld.
Disrespect is punished by the loss of an amount of Accumulation to be determined by Lord Khaos. To lose your Accumulation is a very painful loss that demons will do anything to avoid. It is enough encouragement not to disrespect their superiors. As opposed to his current opponent, Baal has enough self-control to not be goaded into a fight by a statement like, "Are you afraid of losing to me?"