power can weaken with mental disarray

“After all, you view the Sisters as having an aggregate whole in the Misaka Network but
you also seem to think the individual personalities of each terminal must be recognized.
So the overall will has accepted you? So what? Only the one who was killed can
understand the feelings of the one who was killed. If you think about it, it should be
obvious.”
He tore at Accelerator with his words.
He dug into him.
He thought he had cut off all forms of airborne vibrations, but whether he liked it or not,
that voice that was filled with true malice tugged at him, pried open his mind, forcefully
slipped inside, and stabbed into his heart. Those thorns he could not pull out robbed
him of his composure bit by bit. The equations that controlled his great power fell into
disarray.
“And there is no longer any way for you to determine whether you have truly been
forgiven.”
Accelerator was surrounded by Kakine Teitoku’s trick.
He was trapped in a cage made up of gentle words.
“The final piece that might be able to tell you what those you killed thought is this. These
final pieces of personal information to remain in this world. But…does it really matter?
If you crush them, destroy them, and send them into eternal darkness, your sins will
disappear. Suspicions go unpunished. If it is something no one can ever know, then
there’s no problem, is there? And then you can return to your peaceful world with all the
loose ends tied up.”
Accelerator’s consciousness had been thrown into such disarray that he could barely
grasp the words being spoken.

- New Testament Volume 6 Chapter 7 Part 6