To move something like this, an engine has to be pretty big. And they have moving parts and stuff, so you don't want that out in the open. [Ren spreads his arms as if trying to encapsulate the size of an engine, but seems to realise after a few different angles that that's not happening, so he lets them drop again. Only for a moment, though, because in the next second he's clapping them together excitedly.]

You ride a pegasus? [Wait, right, other question happened too, didn't it?] Oh, I know a bit about using swords, but I guess I've never really trained with one.

[It's difficult to explain even to someone of a similar time period to him - Ren's powers have given him the sensations and muscle memory of swordplay often enough that he has some familiarity with the weapon, but his own body isn't trained to execute those movements. It's somewhat of an awkward position to be in, especially now that he might actually need to fight for himself.]

Lances are pretty cool too, though~