You’re very confident that he’s telling the truth about the fact that the late Messire Kaver was in his employ, and tasked with investigating the baron. You get the sense that he does sincerely regret Kaver’s death, though under his current understanding of the circumstances he doesn’t feel particularly responsible.
…You do get the sense that your group isn’t exactly the sort of people he’d usually prefer for a task like this. He clearly respects your martial prowess, but Messire Kaver was a gentleman far more than a warrior, and he does seem to have some doubts about your ability to pull this off subtly (and, for that reason, is being more explicit about some aspects of what he’s requesting than he usually would be).