Toaru Majutsu no Index Light Novel Volume 19/Chapter 3

Synopsis
Accelerator and Awaki knows about Unabara and Motoharu being magicians, though they just think of them as ‘espers infiltrating from another organisation and ended up betraying their own’. Accelerator also thought of now that the ‘Level 6 shift’ experiment’s over the sisters aren’t disposed yet, so he wonders whether the experiment was built to fail from the start.

And as a final piece that shows even Accelerator has mellowed, he told a passing kid he saved before in a hostage situation “I’m the Strongest Level 5, I don’t need brats worrying about me”, just to prevent the kid rushing in and kill himself accidentally. In addition: “Listen, even if someone is suffering before you, the kind of person that can take up arms without hesitation to shoot down the villain is no better than a villain himself. The kind that doesn’t care about others, doesn’t give second chances; someone that kills is given a reason, is definitely not a hero. You don’t have to become that kind of person. That’s my specialty. Only I have to go through that” – he’s really trying hard to become like Touma, with the speeches and all.

After some negotiations, Director Oyafune decides to help Accelerator to take down another director, despite earlier having decided to not interfere with the Dark side of academy city due to threats to her own daughter. Oyafune decided even if she retire there’ll always be threats from the dark side so she might as well go and get rid of the root of the problem.

The 2nd district of academy city is basically a giant weapon factory. The director attacking GROUP has his main base hidden in one of the experimental bomb shelters that get bombarded on a regular basis to test both weapons and the shelters. This director’s employees are like a army, and have Capacity Down(they’ve improved Capacity Down drastically, to the point where if Accelerator or Awaki even activates their ability they self destruct) installed.