A little bit of both, really. He hadn't really expected a different answer here. Tell Sonia that Tarn was merciful, or probably die. Those are his options. (Or he could, you know, lie. But the thought doesn't quite occur to him.)

If he were really and truly smart about this, he'd just take the deal and run. But ... Instead, he approaches Tarn. Holds out his hand as if to shake. Then - with no warning, but surely not much surprise, he ducks past the man instead, bolting for the other side of the hallway. His legs are short but he moves decently fast given sufficient motivation. Like now.