"It is no more kidnapping than our attack of Vark's guards will be assault. We will regret it down the line if Vanthus is not taken care of. Who do you think killed their parents? That fire sounds like an inside job, and it clearly wasn't Lavinia. He is also consorting with smugglers, pirates, and thieves from what you've heard, so he's probably wanted for crimes, or would be if they were known. If you handed him into the Watch, they would probably thank you."
"Of course, don't try for Vanthus unless it seems likely to succeed, like if he's alone."