[As Felix talks, Finn feels himself getting stiff in his stance. He takes the opportunity to stretch it out, working through his usual set of limbering-up exercises. His neck cracks pretty impressively right about when Felix gets to the part about advanced weapon's training.

When Felix locks eyes with him, the stretching stops. Finn's stood frozen mid hammy-extension, all attention focused on his teacher.]

Fifteen years. Wow... Dude, I'll be older than you by the time we're done. [He thinks. How old was Felix anyway? Human ages were tricky. Anywhere from 25 to 50 felt equally plausible. Regardless, it's meant as a joke, and he smiles.] Guess we better get started, then. Wouldn't want to get 'complacent,' heh.