>>1843369
Alright then, I guess we need to run through the logic here.
1. We’re not using any information that Sensei wouldn’t have had access to at the time, and we’re doing this from his perspective, using the data available to him at that moment.
2. Sensei knows that Aris was seemingly fine until she touched one of the robots Veritas brought in.
3. Sensei knows that Rio is Millennium’s student council president, that she’s reclusive and considered a weirdo, and that Himari is occasionally willing to work with her even though she doesn’t really seem to like her.
4. Rio says during the conversation "This event has proven that the threat I only hypothesized to exist is real." which can be read as her having had strong suspicions about Aris' possible true nature before the incident happened.
5. Rio never contacted Aris beforehand.
6. Aris has no idea what happened.
7. Rio seems to know a decent amount about the Nameless Priests and their technology.
8. Sensei consistently sees the best in his students and believes in them, which heavily affects his judgement.
So, wouldn’t the logical thing for Sensei to do here, based on the data he has available to him at the moment, be to ask, “If Aris is that dangerous and you suspected it for a while, then why didn’t you inform her that she shouldn’t go around touching weird robots?”
> Rio showing up in person was her own ego.
I’d consider a significant part of V2C2 to be caused by a mix of Rio’s ego and her desire to feel like a good leader, combined with her paranoia. Many of Rio’s actions during it seem to stem from her subconscious need to see herself as “a strong leader who makes the hard choices so that her subordinates don’t have to” which leads her to dismiss all other possible courses of action until it all blows up in her face. If she didn't have this problem, she probably could have worked with Himari to come up with a less violent solution instead of immediately imprisoning her when she disagreed with her.