Nick only barely flinched, raising his eyebrows. He should've expected as much, but this answer was better than a straight out 'no' and a firefight. "I'll be in touch, Castle. Keep your nose clean," he quipped (it wasn't remotely likely that Castle intended to stop his self-righteous kills) and stepped aside, muttering in his earpiece for the agents outside the let the man go. He was going to keep a close watch on Castle. The man was either going to be a future asset or an accident waiting to happen. Either way, Fury was ready for him.