fiamma sword negate

Kamijou trembled as the giant sword that could split a mountain range in two was once
more casually lifted up.
It lifted up almost completely vertically.
And then Fiamma’s sword swung down all at once.
The air shook.
It was almost directly above them.
He had corrected his aim and dropped the giant sword down from directly above. The
Elizalina Alliance city was sliced in a straight line and the stone building Kamijou and
the others were in took the brunt of the blow causing it to be almost completely smashed
to smithereens.
A cloud formed.
The difference in air pressure created by the slicing of the atmosphere created
something similar to a contrail.

That strike had affected the weather.
And then...
“Oooooooooooohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh!!”
Kamijou Touma yelled out and stuck his right palm straight up.
He could hear an unpleasant creaking noise coming from within his bones.
But that boy’s seemingly ordinary arm managed to receive that strike that could slice the
map in two.
(Did I...stop it?)
As it was her first time seeing Imagine Breaker, Elizalina looked shocked and Lessar
seemed to find it hard to accept despite having seen the power before. However, he
didn’t have time to explain every little thing. Kamijou wasn’t even sure none of his bones
had been broken.

- Toaru Majutsu no Index Volume 20, Chapter 2 Part 6