Oh hey we get to check on Olaf and Luna. Last time I showed Luna, it was here worrying about Lubo, and now she's got more to worry about it seems. Sadly they won't be showing up much because we have more important things to worry about. This scene was necessary, however, in order to get Lopu up to speed and figure out where the heck Mako might've gone to.
If you're thinking the Chitago spell looks familiar, that's because it's the Lunar equivalent of the Solar Spell Komanu, which was shown in Chapters 14 and 15, performed by Usaro and Rikku respectively. This is actually the first time I've gotten to show another version of a previously shown spell. As you can hopefully infer, each Solar Spell has it's own Lunar equivalent and vice versa. The main difference between the versions is the name, and appearance.