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 slowly pushed 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 was not negating it quickly enough and the pillar of light was approaching millimeter by millimeter.

[...]

Kamijou’s feet slowly but surely slid backwards.

The power behind the pillar of light nightmarishly doubled as if to rip up his toes that were digging into the tatami mat.

[...]

An odd cracking noise was heard from Kamijou’s right pinky.

When he realized the finger was bent —broken— at an unnatural angle, the pillar of light attacked with tremendous force and finally knocked Kamijou’s right hand away.

Toaru Majutsu no Index vol.1 ch.4