Something I didn't understand from the movie "Babylon 5: Thirdspace". We find out that the Thirdspace Aliens are able to telepathically control people in normal space by projecting their telepathic abilities through the jumpgate into thirdspace. However, people start to show signs of being controlled by the aliens even before they open the gate. In fact, this is a large part of the driving force towards towards them actually opening the gate. Does this indicate that the Thirdspace Aliens can project their powers through the gate even while it's closed? Or is there some sort of echo which is left over from the aliens' last visit to normal space (more than one million years prior)? Babylon Wikia uses the term "telepathic resonances" but I'm not sure if this is from the film or just a fan term.
I'd be interested in any explanations either from the film itself or from the associated novelization.