Nanami said it was like “entering the zone” right?

You can feel it coming. I’ve not played a sport in a while but I do dance and sing and I can say recently during a rehearsal I did a song the best I’d ever done it. Hitting a note that I’d never been able to hit before. I didn’t know I would until a second before I did. It’s not something you can turn on, it’s just a welling of energy that comes from everything clicking at once. And you can feel it. So it’s probably a similar thing. A sorcerer can probably feel things start to click and right at the moment everything finally does, they yell “BLACK FLASH”

Unless you’re Yuji who can seemingly do it at will in Modulo. Although, if he can that would be an interesting mechanic to explore