[He'll keep his phone out for now, at least using it to see what he could. He'll only catch a glimpse of something there, moving. After a moment of looking, he'll keep walking.]

Oi oi oi, you know, what's with someone who follows people in the dark. Are you bored? Are you a stalker? I really don't need another stalker. I seriously already had a stalker on Earth and she was annoying as hell.

What's your deal, hah? [who are you]

[He'll ruffle at his fluffy white hair some with his fingers, shuffling along the street, practically talking to himself unless she cares to answer.]