[Avvesione]

Here are my thoughts on the matter:

Spoiler:

It seems like what's happening to Setsuna right now is one of either two things. She could either have been attacked by a new fighter or she could be overexerting herself.

If another person attacked her, then, well, it could potentially be anyone powerful considering they hit her in the middle of a Dean Drive Black Bird. The question is, why and that varies from person to person. If she was hit, then that'd make sense that she'd miss Teruyama since it'd throw her trajectory off. However, there are no visible wounds, yet, so it's hard to say what hit her to cough up the blood.

On the other hand, if she is overexerting herself, it could be due to the damage she received from earlier in this battle. She took that punch from both Mio and Teruyama which had her coughing up some blood (and I'm guessing this battle is still moments after Cruz left). She's also been talking about how she should be stronger than Teruyama and how she's the top of the Shoujo Butai, so maybe she's putting her body through more stress than ever before? That would explain why her body gave out during the DDBB, but doesn't make sense that she'd miss as a result.

Either way, it looks like the fight here will be ending soon. Doesn't seem like Setsuna will be able to fight much longer, though you figure she'll continue considering how arrogant and prideful she is (I'm guessing Kuchinashi will have to Maiden Restriction her before she hurt herself even more). And if there's another enemy that's joining the fight, I can see Kuchinashi, Mio, and Teruyama teaming up to fight whoever (or whatever).

Also, didn't mention this earlier, but I'm very happy this fight didn't end up being resolve offscreen (like Seto's and Solva's fights were).