Brilliance! :)

Heh, we can figure out ways to keep her around if Curdle were to get captured. Or, if there's something he could do or say that might convince her to help him? I could possibly have him do that. He's also capable of more magic than he realises just now to accomplish his goal, so if there is the chance that he'd get caught in or near the cart, he might show that and then realise for himself and new options appear for getting him and that urn out of the city. 

Options that don't require Miria and then he can just kinda, walk up all sheepish like once they're outside the city. lol