Atticus would find the practice barbaric under any other circumstances. Right now, he derives a vindictive amount of satisfaction from knowing that Benedict will be punished for his actions.

"The Magister may receive a medic here. One of the Tranquil, perhaps."

At that he visibly starts, before biting down on the instinct to protest. No; he does have bargaining power, but not in this. Pursing his lips, he nods and says nothing else.