You can totally see in the comic, that Julian started out as reasonable! Well In relation to his dealings with Carreyn X3
Too bad he didnt pay attention to Lucien more (though how on earth did he just walk into an important meeting? surely the guards would have stopping him for such a silly reason? )
Stop of kid who survived being punched through a wall? It seems the level of physical threat you'd have to make to stop him would be quite, mmm,
unhealthy to direct at your ruler's son.
As for Julian, I wonder how much he tried negotiating and how much was simply, "I won't stand for it!"