There's a big twist and a major revelation in this episode. As someone who has read the Toaru Majutsu no Index NT light novels, I had already foreseen the outcome of Mikihiko's research. I would like to go into detail about it but I'd end up spoiling the story, so it's best that I refrain from doing so. I have no complaints about the animation in this episode. The dramatic shift in color is also fitting, considering the situation they're facing.