Mulling over some things in the wee hours and I got to thinking about the
Gary Numan case - as an example.
If Numan and his friend could see the man, could the man also see them?
What would have happened if someone had bumped into the man (easily done at a crowded train station) - would they have just passed through him?
If the man could only see what was going on around him in
his time, eg the 1940s/50s then the people around him would have been in different positions to the people in the 'modern time' and he would surely have had to pass through them, otherwise he would have double the amount of people to avoid walking/bumping in to.
If the man
could see the 'modern' surroundings, then how would he have found the corridor as it was in
his time, ie with a door in it/not blocked up?