Jim knows a threat when he hears one, and despite their location, and the situation, his gaze narrows just fractionally at the wraith. Playing on his compassion in a way he knew would work; Kirk wasn't surprised at how quickly he caught on. The only lives Jim cared about were everyone else's, no matter how small. If mother could see you now, Jimmy.

"He'll sit in the brig until I can figure out what to do with him, organize security in the meantime," He says firmly, decisively, and knows he's speaking like he's the captain, but he doesn't know how else to think of himself right now. Megamind, after all, had broken rules that were universal; something Jim knew about and how to respond to, unlike what had happened with the alien at his side.

But Kirk knows he needs to do more. He needs these people to look to him as a leader, not someone to fear but to respect, and while he had a loose grip on it now without stepping on the captain's toes, he had to decide where to go from here.