This conversation, as useless as it may seem to him, was beginning to amuse Vader. It brought back memories of long nights spent in complicated discussions over some political matter or other. His angel never liked to hear of his opinions in these moments.
"They remind me of bounty hunters," is his reply. And that really was how he saw Niflheim. Just a bunch of leader-less bounty hunters out to find the best contract.
On the other hand, not even the most untalented hunter in the Empire was so...
"It is what they expect of us. Those who actively attempt to disturb the order of Asgard count on your reaction of caution and fear. They wouldn't know what to do if they were driven out of their comfort zone. Terrorists seldom know how to give satisfaction when it's demanded of them."