Isa hasn't been speaking loudly or even normally from the start of their conversation, only whispering, which on might notice - onl been whispering during this entire"Castle? In the that cursed Nobody world? So you've been there."

Because he wasn't sure if this boy had ever been in Organisation, so spelling out the name probably wouldn't be helpful.

Isa's head stopped hurting, at least. It was probably all this Riku connection to him, and no, not Lea him, the cursed letter man him. Hims. Or both.

And then Isa frowns.

"I don't suppose you've ever heard of someone with the power over your memory? Or over 'Riku's' memory?"

The very name of Riku is weird to say, as he rarely pronounces it, but...

Maybe because Lea never met the memory witch, and Riku was Riku... it would be something to encounter someone who 'met' her, for whatever defition or meeting. Something good or bad, he didn't even care to think too deeply on it.

"Nevermind, why should I ask a stranger... How long have you been here?

"In this world?" As an afterthought, because notXikur might think he's asking about Castle The Never Was with all the Xs.