You wouldn't.

[ He doesn't say it in any kind of offended tone, just matter of factly. ]

It'd be too much like you give more of a damn about me, using a nickname. You wouldn't want the rest of the crew to feel left-out. Plus, you know Mick would resent you stealing his thunder like that.

[ It's what makes her a good captain, after all. But Nate's trained in observing people and facts and things. He knows. ]