When you stare someone in the face... where exactly are you staring?

Pick any of these portraits…

Shot 1

Shot 2

Shot 3

Shot 4

Shot 5

I cannot look at both eyes at the same time. I’m constantly going back and forth between the two and gradually my vision settles on the forehead just above the bridge of the nose.

Is this where the concept of a Third Eye arises from?
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Still Photography Portraits are different than in reality. The subject only has to look at one lens… rather than two eyes… it’s similar to only looking at one eye. And the eyes from a Still Portrait don’t move around looking back.
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Where are we looking when we’re looking at each other?