[Inside, Fai feels as if a knife was just dropped through his chest, but his only response is a blank, expressionless face and a slow headshake.]

If he was dead, I'd know.

[The syllables are flat and low compared to his normal voice.]

His mind and mine have been connected since we were born. Since the morning he disappeared, I haven't been able to feel it, but... no, he's not dead. I know he's not dead.

[The flat emptiness he feels when he tries to find Yuui is a wall, something keeping them apart. It's not a hole, not a gaping wound where his twin ought to be. That's what he needs to believe, to be able to go on.]