due to the fact that we were facing each other and she was looking toward that road. So, I saw exactly what she was seeing at that moment. Even so, I didn't see more than a fraction of a second, enough to convey motion of the car, placement on the road, speed, and direction of travel. I received a visual record of that moment from another mind
My "understanding" of portals isn't based on science, or what you'd get from most science fiction. Rather, it's what new-agey and other spiritual people (like me!) would attempt to describe as more like a dimensional transition. And even there, it doesn't mean one is traveling from the third dimension to another one (presumably higher than '3'.) It can be a portal between universes, both of the 3D variety, or of dimensions not normally associated with science and mathematics. I know that's not going to make sense to a scientist, but they don't usually try to make scientific sense of spiritual matters, either
I also define it as a spatial portal (not flat, like say a toroidal black hole and 2-dimensional singularity as proposed by James Hogan in the "Gentle Giant" series) but a volume that acts as the opening. A person would appear to fade away or into being when crossing through it. That's why when you described it as "filmy" it made me think that what you saw was either a portal not fully formed, or an overlap of universes. I see the latter concept used sometimes in the otherkin communities for those of alien-kin (that's a whole 'nuther "world" there
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Now, here's another story I asked someone from a different message board to post, and it also sounds like a portal situation. (Disregard the replies except the one from "jinnitaur" as that's me.)
http://www.furry.org.au/aatheus/taurboard/messages/303.html
I'll have a look over in ASAH to see how your post is doing. I might have another item to add (then I'll add it here.)