I'm enjoying the "lack of interest" on both their parts. They are strangers meeting, Wren is aiding in a slight way and Chall is intent on getting back on the road (though is younger and far more involved in figuring out his host - a momentary diversion) and neither is thinking this could be more than a quick stop along Chall's journey. 

Wren is coming off cold and I think if I spend too much time in his head, he will do just that so don't let his thoughts make it seem like he's making all of these faces and being all dark and broody. I suppose he's far more reticent and naturally very like anyone else of the country might be, though much, much less in awe of Chall than his neighbors would be in his place.