The first few days involved a lot of rattling of the bars, insisting he can't be treated like this, demanding to be allowed contact with his family in Tevinter; but Benedict has gone quiet lately, nursing his injured pride and growing fear.
The turning point came when he tried to make a break for it, on one of their many journeys to the library. He'd attempted to slip between the guards, shackles and all, only to be caught almost instantly and manhandled by both back to his cell. He didn't accompany Atticus to the library that day, but has since sworn he'll behave himself, no doubt as a result of the soreness in his arms and upper body from when he was grabbed slammed against the wall.

He's been silent and sulky since then, avoiding looking at Atticus but no doubt still very much open to any visitors who might address him.