A.N.
Thank you to Gur40goku for inspiring me re-watch this episode and look at it with intent to write a story on it; probably didn't go the way you expected but thanks for the motivation!
I'll be honest this started off as part of my "Miss Bustier Does Her Freaking Job" one-shots but then I re-watched the episode to get some direct quotes and realized that Miss Bujwa isn't in it (although it takes place in her classroom) and Ms. Mendeleiev isin this episode. So while I can't write a whole series of stories on Ms. Mendeleiev's screw ups like I can Miss Bujwa (not enough show time!) she still makes some glaring errors in this episode when it came to ignoring what is obviously an Akuma and just watching her student be attacked.
So I started writing about her noticing that it was an Akuma and pretend to ignore it long enough to send out an Akuma Alert (something I think might be in-character for soft-hearted Miss Bustier). But then I realized; Ms. Mendeleiev is this BAMF character who has been known to stand up to Akumas one-on-one without fear (Example: Rogercop), why would she ignore this one? After all, real life teachers have been known to go toe-to-toe with terrorists for the sake of their students and I can't picture someone like Ms. Mendeleiev sitting on her butt when someone is in danger. And then the character took over my story and demanded the right to be a Bamf and fight an Akuma literally. How rude, this is my story not yours Ms. Mendeleiev!
And for those naysayers that claim a citizen can't fight and win against an Akuma and say this is total CRACK!Fiction with no chance of being a possibility… First of all this is FF so :P Second, remember how Vanisher's power is just being invisible? As in, literally the only advantage she has is being invisible and once that's removed, she's this weak 14-year old nerdy girl? Hawk Moth might have given her a bit more body strength so that she can fight against the heroes, but you try fighting someone 1.5x taller than you while you're tangled in a big lab coat, arms pinned to your sides and you can't see (in her defense, she was taken completely by surprise). I think very few people can fight all that well under those conditions.
Oh, and I have this idea that Sabrina's glasses were either knocked off or askew after being whipped across the face with a lab coat but it's hard to have someone notice invisible glasses being knocked off an invisible face so… :P