Once a gift has been given, it can’t be taken back. It can be refused or returned, but when a gift is taken back, something is always broken.
In the moment of becoming a teacher, he tells his servant to strike him, because he also has a part to play. He’s a servant himself, so how would he be able to fool others and give directions to them without immersing himself in the situation around him?
There’s a war going on, and he can’t be the only one who comes out unharmed.
So he hides his eyes and picks up his courage to pronounce judgement on the judge, because there are things more important to him than his own life.