I see Aka-sensei is done playing Apex.
The doctor and Serena didn't get much screen time but I feel like Aqua and Ruby are distinct characters just with similar traits. So seeing Ruby be wilfully ignorant despite being shown to be very smart when she applies herself, I feel like it's almost... forced? I can't explain it exactly but it gives me a really bad vibe, like I'm underestimating the shitstorm that's about to happen.
I don't think I'm overthinking this but I could be completely wrong.