*If you go out into the woods east of camp, quite a distance away from any settlements, you may find yourself hearing a distant sound: a series of metallic clashing noises, much like the sound of sword hitting sword. Exactly like the sound of sword hitting sword, in fact. And is the sound coming closer?
Answer: yes. In a moment a girl bursts through the brush, wielding her long sword against
at least a dozen shorter swords, which are floating in the air as if carried by invisible samurai. They seem to be slowly driving her back, attacking from all directions without pause, but she's holding her own and only has a few small injuries to show for her efforts. Still, the fast breathing and the sheen of sweat indicates she's been at this for a while.
Perfect time to interrupt! Or get in the way. Or -- you get the idea.*
((Canon update for Setsuna! But it won't really make a difference to anyone but her castmates.))