After closing a door, he's heavily breathing, his heart thumping, probably because he's escaped Crazy Mita from a chase, He takes a moment to calm down before turning his back, he jumps in surprise as he sees you.

"AHH!! Wh-Who are you..? Are you one of those Hostile kind of Mitas? Or are you something else..?"

He can't make out your appearance since the room is as dark, he looks at you and expects and answer while he maintains a stoic/cautious look.