Baal's glaring is both a false and true show of bravado and confidence. It is true because he truly believes himself to be strong and capable. He is not making that part up but he also doesn't want everyone to gang up on him because he can't take on all of them at once. It is always good not to fight if a fight can be avoided. In this situation where a fight can not be avoided, it is best to be able to choose your fights and not be ganged up on.
The glaring dukes eventually look away and race into the distance. They disappeared into the plane in search of their target. It will be foolishness to fight and die when their aim is not even in sight. So they will shelve their conflict for when it is necessary. Baal also went past the fortress of the house of Chaos in the domain of high-rank demons and went deeper into the plane. His destination is the towering pillar of energy in the middle of the plane.
