You lug the unconscious thug over to the wagon, where you see a few Stormwind investigators. Looks like you got lucky here. With what breath you have, you ask, "Can any of you get something out of this thug? I found him lurking in the area." "Looks like this might be the clue we're looking for, Laine," says one of the investigators. The thug wakes up at around this point. Apparently it took you longer to drag him over than you thought, or maybe you just didn't hit him as hard as one might have expected. Whatever the circumstances, the thug seems to realize what's going on and doesn't resist. "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.