She sees his sneakers and the hem of his coat first, through her phone's screen; it gets her to pause just in time to avoid a collision, and she looks up at him.

There isn't any recognition in Alya's expression as she looks him over. The look in her eyes is one of a stranger coming across a stranger, trying to figure out where the heck he even came from (she's almost certain the space ahead of her was empty just a second ago) and trying to figure out what to say since he's just... standing there. Waiting.

"Uh... hello?"

Nailed it.