The stranger — Geralt — moves to leave so quickly that if Altaïr were to give his name, he would have to call it out to a seemingly uninterested back. He could, it's only fair since he broached the topic first, but...he'll leave it, then.

It's never a bad thing to gain more information than you give.

He mounts his horse, an amused smile on his lips, and rides off in the other direction. There's more for him to learn before he returns to the city.