That's interesting, so the difference wasn't that she was fully charged or anything, but that she decided to stop copying Himari. Mii and Himari becoming more independent from one another has been a reoccurring theme, but it looks like Mugi might also be moving in that direction of trying to become less dependent on Himari. Also, very ominous Mii ending monologue there, yeesh.

All in all, continues the trend of having the S2 Grand Prix episodes be really interesting on a character level, love to see it.