"Have you considered turning yourself in?" you say. "You'll probably be better off in the care of Stormwind than you are now with what you're doing." "Huh?" says the thug groggily, starting to stand up. "Yeah, I'll go there...maybe they can help me get rid of this headache." You walk with the thug to the nearby wagon, where you find a set of Stormwind investigators. You're about to explain why you're here with this thug when the thug does it instead. It seems that he's woken up some while you walked. "I surrender," he says, putting up his hands. "Great," says the most smartly-dressed of the investigators as the other two awkwardly tie up the thug. "That'll save you a headache later." "So what do we do with him, Laine?" asks the investigator who's worse at tying up the thug. "We find out what he knows," says Laine.
Try to keep the thug calm. That should make him easier to interrogate. Try to force a confession out of him before he gets too comfortable. See what Laine's plan is. Let him deal with the thug...at least to begin with.