User blog comment:EmirK/Who do you want for the main antagonist in Toaru Kagaku no Accelerator?/@comment-7719364-20131113004000/@comment-24001115-20131113183633

I think they mean that they won't meet, but get involved in it. Like in Endymion in which Accelerator destroyed one pillar while Misaka destroyed the other without knowing each other that they are involved. Or in the Academy City Invasion Arc where Kamijou handled the magical affairs (vento of the front and Fuse-Kazikiri) and Accelerator handled the scientific affairs (Kihara Amata). To summerize it, they fight against the same enemy, but they don't know that each of them are involved. But i can be wrong ...