Kirito's tense voice pierced through that opening.

“Burst element!”

Eugeo could not instantly catch what his partner said as it was
too fast. He understood its significance only after the
phenomenon occurred.

A brilliant whiteness suddenly radiated across his vision.
An intense light, as if Solus had descended. It was a simple art
that merely set free a luminous element, one of the «elements»
that served as the foundation of elemental sacred arts, but Kirito
hadn't recited the art ritual for generating elements. Just where
did—...

No, there was an element. There were luminous elements,
drifting in midair, called out by both of them to illuminate the
equipment vault tens of minutes ago, weren't there? The
neglected elements were on standby for any sequential art
rituals. Kirito gave the order for the element floating over his
head to be set free and produced that immense light.

(Alicization Rising, 150)