invisible shatter

There was the heavy sound of a collision.
If the impact came straight down, it would crack his skull to pieces without a doubt.

However.
(That attack...)
Kamijou skidded to a halt.
She had anticipated his movement, one step ahead of him—so if he didn’t take another
step forward, it wouldn’t hit him.
(...It’s the one I’ve been waiting for!!)
Then, he took his clenched right fist and thrust it straight into the space one step ahead
of him.
There was a roar, like a balloon popping. There was a sensation, like an invisible, giant
soap bubble breaking, and the attack that would have hit him was instead blown away
without a trace.
“Huh?!”
Agnese, a professional, would have understood the strange thing that just happened
better than Kamijou, an amateur.
He ran straight through the now-empty space like a bullet.
She hurried to swing her angel staff around.
But she couldn’t get as much power as she wanted due to the unforeseen situation...
...Kamijou dove into range...
...Agnese’s staff finally hit the marble pillar...
...Kamijou’s head bounced to the side with a high-pitched noise...
...But still...
...But still, he never once opened that fist of his.
A sharp crashing sound echoed.
The back of Agnese Sanctis slammed into the marble pillar behind her.
Her consciousness wavered.

- Toaru Majutsu no Index Volume 7, Chapter 4 Part 4