dodges twenty flying rails

In that instant, the gravel below his feet exploded like he had stepped on a landmine.
A large amount of gravel scattered in every direction and at close range it was
reminiscent of a shotgun blast.
“...!”
By the time Kamijou realized what was going on, it was too late.
He immediately brought his arms up to cover his face and over a dozen small stones of
various sizes struck Kamijou’s body. Just when he thought his feet had been knocked
from the ground due to the large shock, his entire body was forcefully blown back. He
rolled along the ground before finally coming to a stop a few meters back.
“...Too slow,” said an unpleasant voice that sounded like pieces of rusted metal being
scraped together.
The intense pain had disoriented Kamijou and he merely looked blankly in the direction
of the voice completely forgetting to stand back up.
“That’s nowhere near enough. That speed of yours is just 100 years too
sloooooowwwww!”
Accelerator stepped on the ground again.
He must have converted the vector of that shock in some way because a steel rail lying at
his feet stood up on end like there had been a spring under it. Accelerator used a
backhanded blow like he was brushing a spider web away and knocked the rail flying.
His action had been nothing more than the slight strike one would use on an
unreasonable child, but a great noise like a church bell resounded throughout the
switchyard. The steel rail bent into a shallow V-shape and flew straight for Kamijou like
a bullet.
“!!”
Kamijou frantically rolled and jumped away from its path.
Immediately afterwards, the crushed piece of steel pierced into the ground like a holy
sword in the exact spot Kamijou had been lying in before.
Kamijou thought he had just barely managed to avoid it, but the mass of steel weighed
hundreds of kilograms. When it struck the ground, it sent a large amount of gravel flying
into the air. It was like a meteorite striking the sea.

Countless small stones stabbed into his body.
The shock this gave to his chest forced all of the oxygen from his lungs.
“Gh...Ah...!”
Accelerator fired a second and third steel rail at Kamijou who was rolling on the ground.
Those masses of steel flying through the air were as unavoidable for a human as
handgun bullets.
A direct hit from one would be certain death and even barely avoiding one would lead to
damage from the gravel scattered by the hit, which would slowly but surely add up and
lead to death.
All Kamijou could do was continue to roll along the ground. Beyond that, all he could do
was try to read the direction the gravel would be sent and jump in the same direction to
reduce the damage as much as possible.
He could not approach.
He avoided 10 or 20 of those steel bullets and was struck by the scattered gravel each
time, but he was gradually heading away from the center of the switchyard and to the
outer part.

- Toaru Majutsu no Index Volume 3, Chapter 4 Part 6