Respar tries not to make a sound when the brand burns into his tricep, but grunts and groans escape his lips. Even a curse word or two (If anyone speaks it, he curses in Celestial). But he does not issue threats.
Once the group is alone he turns away from the others and begins to whistle tunelessly for a few minutes. He seems to be ignoring the others in the cell. But he finally turns and looks at the fiery barbarian woman and the tiefling.
"Oh I assure I can be useful. But before I agree to help you with your pointless attempt to smash and kill your way out of here, leaving everyone behind in various states of dismemberment and death, let me offer you an alternative. It may not be as… satisfying to your bloodlust, but I think it might have a slightly better chance of achieving escape, which is my priority."
He lowers his voice and says, "Right now there are few enough guards out there we might be able to overpower them. But if we suddenly start tearing chains from walls and what have you, they'll call for reinforcements. However if we can just get one or two to come in, I can have us ready to totally take them by surprise, and possibly very quietly. You might prefer to put on a loud and violent show, but I prefer to work quietly."
He then raises his hands, freed from the manacles in his lap. "Now, what say you all?"