The cool thing about the setup of this show is that power can be based solely on Otome. So in a one episode fight they can spin the downfall of a nation out of it. Before Nagi's invasion we hadn't seen any military power displays at all, and from all the Otome performances so for it's quite likely that the Pillars would have laid the smack down on his little invasion if they could have used their robes.
And what's the deal with Natsuki and Shizuru? After the sad aftermath of HiME's thwarted love are they really connected now? Apparently Natsuki knows when bad things are happening to her woman, and Shizuru is so awesome with her straight face as the disallusioned teen tried to bed her. As if she's not disgusted, just not interested in Tomoe in that way.