Became human when he arrived... So he was not human when he was in his own world, or place, wherever it is that Rifters arrive from. It interests her because it offers something to investigate, something to look into; she has not spent much time learning about anyone from beyond Thedas, but it seems she's being given a rare chance to learn for the first time in a long time.

"I see." It's obvious that she's curious and she finally places her things to one side, turning to look at him properly. Her head tilts, just a little, before her lips curl into something almost like a smile. "May I examine you?"