And then Thor’s fist fell down upon Kamijou’s face two or three times.
Kamijou did not even know how many blows he had received before he managed to twist his body and just barely avoid Thor’s next blow.
After that, the situation grew utterly confused.
They were both trying to get on top so they could keep the other from moving, but even that simple goal grew uncertain partway through. They would punch, be punched, and then punch again. As the exchange of blows continued, all their complex thoughts were torn from their minds.
It was unclear what exactly caused it, but Kamijou and Thor both suddenly stopped their scuffle. The right third of Kamijou’s vision was blurred

Toaru Majutsu no Index New Testament vol.5 ch.2 pt.6