Wells might say any number of things here. But like he said, he doesn't know the girl, and he doesn't know the situation. And the last thing he wants just now- though you'll have a devil of a time getting him to admit it- is to give Zuko a real reason to hate him.

So instead he just nods, and gestures to one of the rats to bring him a no-booze Smoking Mountain for the kid. Looks like he could use it.