Episode 4
it might be me.... but holy shit I don't know whats going on. This show is a complete mess to me by now. Random organization names, random and switching allegiances, former enemies out of the railgun side anime-thingy show up and they expect you to remember them,
a lot of weird techno-babble that doesn't make sense.
I'm still a giant fan of the Esper abilities and they are freaking interesting (so is every fight against them because they need to figure out a method to counter and find a weakness), but this whole stuff is beyond my comprehension by now and I'm not even sure if the author/writer himself knows what's going on and whether he has checked his story continuity even once.