We still don't even know who the Night King really is, so motivation is tough to figure out. As of now all we know is Bran saw it and it was some guy who got stabbed with dragon glass by Leaf. Hopefully we find out more although only six more episodes left so they'd better get on that quick. With the wall down they should be in Winterfell pretty fast.
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"Think I'm gonna be the scapegoat for the whole damn machine? Sheeee......."
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