As Kakine finished his sentence, his white wings let out a ‘swoosh’ and projected a brilliant white light.

“?!”

A burning pain forced Accelerator to back away from Kakine involuntarily. At the same time, he noticed the change in the situation.

Accelerator who could reflect all vectors was actually hurt by an outside attack.
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“That was diffraction. Light or electromagnetic waves change direction when passing through narrow gaps; this is common knowledge even in high school textbooks. Using multiple gaps at the same time will make the waves interfere with each other.”

Simply put it was by diffracting light through the countless unseen gaps on the wings to change the nature of sunlight and use it to attack Accelerator. It was not that the white wings gave off light, but that the light itself was changed by diffracting through them.

“Ah, the value of things depends on how you use them. So, how does it feel to be burned to death by sunlight?”

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“… Go back and study up on physics, you idiot. No matter how you diffract sunlight it doesn’t change the nature of it into something like a beam of light that kills.”

“Hm, that is indeed the case with the normal physics of this world.”

Kakine’s six wings curled up and gathered strength.

“But! My Dark Matter is matter that does not exist in this world! It completely disobeys the laws of physics of this world. Sunlight that gets diffracted by the Dark Matter will also have its own set of laws! Foreign bodies are like this: by just mixing in a little bit, the world will completely change!”

Toaru Majutsu no Index vol.15 ch.5 pt.3