For any photon we only know two things about the path: where it was emitted, and where it interacted with another thing. We don't know the path it took to get there.
This is to note that the so called "speed of light" is only a measure of the ratio between the "straight" distance between points and time. Statistically light travels in straight lines due to the Feynman path-integral or whatever, but there's a slight chance it takes a "longer" path. I wonder what this implies for speed of light limitations...
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