Great!
I would say that this picture is "hitchcockian", there is a feeling of suspense, of doom somewhere.. (that's only how I feel when i look at it..), it is much more than a flight of stairs, there is a real story going on.
I appreciate the links to both Kertesz and Hitchcock, both masters in the art of communicating with visual means. That's very generous, and I'm blushing...