I hadn't noticed that. Are you sure? If so, no. I think he was truly in awe of his father and out of respect chose not to sit there. I think he thought he could hold the empire together until his dad was well. Of course, the novel says just about the same thing. I do think he was well aware o fhis temper right after Tom was grabbed, but he couldn't hold his anger in long enough. Thus the war of attrition and the enemies planning the trap for his murder which his anger propelled him to fall in to.