Duncan didn't even try to reason with Jory beyond "there's no turning back". Not even a warning. Just a brief shanking even after hearing of his wife and unborn child. I mean, absolutely no Grey Wardens felt fear or hesitation during the ritual? It all happened under ten seconds.
As to the recruitment offer, Duncan is reasonably pragmatic. The Grey Wardens are grey because they have all sorts of saints and sinners in their ranks (And they also tend to keep neutral in affairs not relating to the Blight). From a common cutthroat to a blueblood, it doesn't matter, he needs your help and he's not sure if you'll do it out of the good of your heart.
As to the recruitment offer, Duncan is reasonably pragmatic. The Grey Wardens are grey because they have all sorts of saints and sinners in their ranks (And they also tend to keep neutral in affairs not relating to the Blight). From a common cutthroat to a blueblood, it doesn't matter, he needs your help and he's not sure if you'll do it out of the good of your heart.