“Those blades can slice through anything. They weren’t made to catch on anything. What you’re doing is like taking a metal baseball bat and swinging it at a concrete wall at speeds you can’t control. Receiving these ridiculous attacks is wearing down my wrist, but the same goes for you! Your wrists are at their limits too, aren’t they!?”
His 2000 meter reach held no meaning in this fight.
Both Kamijou and Thor were injured when the attacks were repelled.
[…]
An ominous creaking sound came from within Kamijou’s body.
The same had to be coming from Thor’s body as well.
[…]
After 5 or 10 strikes, a truly strange noise came from Kamijou’s right hand.
He did not make it to 20 strikes.
With a decisive cracking noise, all strength suddenly left the five fingers of that hand. The commands he was sending from his head were not reaching the hand, and it simply hung loosely down, ignoring its skeletal structure.
The joint had been dislocated.
[…]
Thor shrugged and spread his hands out like wings.
Those wings were broken.
Or more accurately, Thor’s wrists were.
Thor’s colorful arc fusion blades flickered a few times like a neon tube reaching its lifespan, and then they disappeared as if dissolving into the air.
Kamijou had no idea where Thor’s limit was. It was possible he could emit arc fusion blades from his feet as well.
And so he asked.
“What will you do now?”
“Continue this of course.”
“I thought so.”

Toaru Majutsu no Index New Testament vol.6 ch.8 pt.3