Kaz lifts his eyebrow at that, but then, had he not chosen to become a Card when Hikaru came to the Velvet Room.

'Him or me...' Hikaru had said to him, still worried.

He'd chosen to stick by Roxas, and when he had asked about Hikaru's options, he would've supposedly inherited one of two Bloodsingers: Reck and Tsubaki. So he "shifts" back into a curious but well meaning puppy, although he can tell that it's not something you feel comfortable discussing.

"Ah. Well, I've heard of a Bloodsinger being bound to a weapon once. Inheriting a 'singer... Hm."