This is the second non-human-coloured young female flying through the air under her own power that he's seen to-day and that's two more than he's ever seen until now. He watches her through a pair of folding binoculars. It's the flying that really intrigues him. How do they do that?

He decides to follow her. When one's being followed by an Observer they don't just walk along after one. No, one goes a distance and when one looks about, there he is. Wash, rinse, repeat.

Damn, Observers are creepy when you think about it....