There were moments when James knew Rook had to regret bringing him as his ghoul and that grunt was one of them. Maybe not that strongly, no, but he could just imagine the raven rolling his eyes at him, if he did that sort of thing, of course. Instead of letting it bring him down, he smiled and carefully pulled himself into Mab's lap. It was a little awkward, simply for the height difference, but he knew that he wasn't going to hurt her doing so.
His eagerness for details, though, died out a little as he listened to the story from his Master. He could taste something not so great on the air between the two kindred and for a moment, it was his turn to regret. Even so, Rook was speaking with actual sentences so it must be important for them both to know, right? Anarchs taking over wasn't something he knew the end outcome of, but from Mab's reaction, he couldn't quite tell if it was good or bad. She was often fascinated by the oddest things - like how much pain a ghoul could take before he tapped out.
What he was more worried about, however, was the way the other man's words sounded. Not the way he said them, but with everything else added. He couldn't see Mab's face, currently, but he could almost feel the energy behind him. Something was wrong with this wolf being in existence but he wasn't sure if he should ask out loud. His master had been the wolf? But... he was a raven. The worry would have been clear on his face, the want to say something but not knowing where to even start.