Japan had still been recovering from the feeling himself when that raspy hey brings back a certain memory. Yes, somehow the sense of having needed to recall that came up, but he brushes the oddness of that away to turn towards the voice. Maybe if the situation were any less serious he'd be more concerned with embarrassment, but for now there's just a worried and surprised sort of expression.

"Holland-san?" He's shocked to find it coming out rather airy, himself.