[It's easy and casual, a normal response to what's being said out loud and utterly avoiding what isn't. He doesn't doubt that it's purposeful.

Altaïr could take the more decisive step of actively interrogating him (with fists), but he doesn't. It's the middle of the day and even if people don't look up as often as they should, beatings make noise. Besides, the newcomer hasn't done anything to deserve it, as far as he knows. For what reason should he throw a punch? A strange feeling?

Instead he steps up beside the man, close but not too close, to look out upon the city.]

It is. And it's a good way to learn the way of Cadens. Though there are some residents who take exception to footsteps above them.

[Ask Him How He Knows.]