Picard wrote:
It means that they've seen you but probably don't want to talk to you or anything, maybe they are preoccupied, or didn't see you (maybe they think you didn't see them).
If you've seen him and he's seen you and he's staring at the ground or far in to the distance then it probably means that they don't want to talk to you and they hope you won't notice them.
You could call it fear, but i think anxiety describes it better.
I'm literally your first post? Cool beans...