rapid enough magic can

A pillar of light shot from within the cracks.
It looked something like a laser beam about a meter across. The light was so pure a
white it looked like it had been melted by the sun. The instant it shot out at him,
Kamijou thrust his battered right hand out in front of his face.
The sound of the impact was like a piece of meat being pressed against a hot metal sheet.
However, there was no pain. And no heat. Like it was a pillar of water coming from a fire
hose that was being repelled by a clear wall, the pillar of light scattered in every
direction when it struck Kamijou’s right hand.
Even so, the pillar of light itself was not completely negated.
Just like with Stiyl’s Innocentius, it seemed to have no end no matter how often he
negated it. His feet planted on the tatami mats were pushed slowly backwards and his
right hand felt like it would be blown away by the great pressure.
(No...That isn’t...what this is...!!)
Kamijou grabbed his right wrist with his empty left hand. He felt a stinging pain in the
palm of his right hand. The magic was eating into it. His right hand could not deal with
it fast enough, so the pillar of light was approaching millimeter by millimeter.
(This isn’t just a large mass! Each individual piece of light is something different!!)
It was possible Index was using her 103,000 grimoires to use 103,000 different types of
magic at the same time. Each individual grimoire held instant death and she was using
them all at once.

- Toaru Majutsu no Index Volume 1, Chapter 4