Yea, was never quite sure when he went to see the Nightwatcher. Although with the few things that seem important to him (His Family, His Country, Codes of Honour) there could be several things that could make him go there. His sons though seemed to ultimately be the most important thing to him. So, if there was one thing that might drive him to seek out the Nightwatcher, I think it would fit his character to be protecting one of his sons.