Well that throws him. He's literally so taken aback that he has to take a step backwards.

"I-- Well it's not my house-- my house-- I've just been hiding here--" she's really got him good and flustered. He can't remember the last time he had a conversation this informal and downright ridiculous, at least with someone of his own kind. He flexes his claws unhappily. "Well what would you call it!?"