The moment she disappears from the Emperor sights; the Emperor say to Silas who was present there.
Yes, he was there during this lively debate between the brother and sister.
He himself was shocked by how the way the Imperial Sister thinks and was awed by her thoughts.
The emperor said that if his sister was born in a peaceful era, then she would become a wise ruler, remembered through the ages.
But, the emperor also said, since she was born in time of war, violence must first be used, then and only then when the world is pacified, that benevolence and righteousness could be practiced.
When men acts like beast, the laws of men will not stop them.
An invincible army and strict code of law.
The Empire needed that while at the same time practicing the essence of benevolence in governing and righteousness in the practice of laws.