Just as Kamijou prepared to dodge, golden darts fired out like machine guns from Aureolus’ suit.

It was fast. The firing, the damaging and preparation for the next each lasted less than a fifth of a second. The level was no longer something a human could handle. However, Kamijou could not simply run away or even turn his back on others. The smallest mistake would have allowed for a dart to lance his chest or other vitals.
[...]
The speeds of the golden dart’s destruction and regeneration more than doubled, continuously ripping the air and flying at Kamijou.

Toaru Majutsu no Index vol.2 ch.2 pt.7