"I'm sorry." The boy's voice is clearer than anything.
In one moment Fai is standing in the splinter of time in the cave which started everything and in the next moment his vision is white, scalding brilliance.
He gasps with it, with the feeling of blood pumping through him, so cold it takes his breath away and yet he still feels it rising within him, a burning heat following as the air cycles into his body and out, swapping old air for new.
He doesn't know what's happening and then he does and is standing, just where he had been, in that suspended cave still, eyes widening with shock as he realises what it means.
His body feels cooler, throat wet and no longer burning.
Fai watches Syaoran, the clone, shatter and crumble away in his original's arms.
The cave starts to tear apart around them, rumbling as if it would collapse in on them and Fai wants to cry but holds it back as well as he always does.
Magic flows beneath his fingertips instinctively, as if he'd never been separated from it. He tries to stabilise some of the world around them, enough that they can move by, enough that they can take vengeance by even in this dying world, even if they don't escape.
Fei Wang, the man behind everything, steps out of his pocket dimension and into the room, holding a version of Sakura, limp in his arms.
Fai has to move forwards now, for Syaoran, for Sakura, for Kurogane, for Mokona.
And also. For himself. For his brother.
For all the people this man has doomed.
Fai begins to cast, magic like ice as it cracks out from him, unyielding, sharp, at his whim and so much stronger than it's ever been before.
It feels good as Fai sets the path towards that man, paves it for each of them.
There's no place to go back to anyway so Fai writes the path in front of them and lets the magic build.
Fai moves forwards with that want to kill that Ashura had wanted turned on him so badly.
Fai casts spell after spell after spell, never tiring in his assault of the one who had taken everything from each of them.