It's a relief for Xeha, too, to see that Braig's unharmed. Calibrating such an intense light flow for a heart like that had been difficult. Precise. But, ultimately, necessary to pick up all the details needed.
This is not a time to dwell in the light or the dark alone, given what they seek to create.

"Very good. I'm going to intensify this flow for a short period - it may be uncomfortable, but nothing worse."

And he does just that.

In front of them, the blade starts to glow.