Be that as it may, logic and feelings, especially hope, don't always go hand in hand. They want their freedom and hope that he will honor his word, so they have to believe him. It is not as if they have any other worthwhile choice.
They have two choices. They can either think nothing of his promise and accept their fate. Or they can hope for their freedom.
Besides, it is not going to cost them anything. Regardless of what they choose to believe, it won't change the fact that they are slaves. So they can be hopeless slaves or hopeful slaves.
Black Knife chose to be a hopeful slave. He knelt down and said, "I promise to serve you with all of my heart, Master Faceless."
Legion knew that he was pretending, but they still applauded him by saying, "Good. Very good."
The other three followed in the footsteps of their boss and also knelt down before promising to be loyal to him.
