SilverWook said:
It might also be a "one way call" scenario. Leia senses Luke, but can't send a message as Vader does.
The one-way call was what I felt it was when I first saw the film.
Regarding the discussion at hand; The moment Lucas explained The Force, it lost it's mystique. It was reduced to a gimmick. Something to be used for the new style of prequel visuals and an easy out whenever he was stuck trying to fill in dialogue between jumping & spinning scenes.