[His entire posture changes, from slouching and unsure to straight and dominant, because he doesn't appreciate his knowledge being doubted like that. Of course, they don't know exactly what he knows, but still.]

I don't think. I know it's a codename.

Besides, we know her name [points his thumb at Sierra.] Don't you think 'Serah and Lightning' is an awkward combination of names for sisters? 'Snow' is a thing, yeah, but 'Serah' doesn't scream something similar to an electrostatic discharge in the atmosphere.

I know where we came from is downright weird, but seriously. It's logic.

[So he tilts his head at them, challenging them to think about it, but more to Kallie because he hasn't heard her answer yet.]