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[–] Skyrock 0 points 1 points (+1|-0) ago 

That's probably just moving dust or the like messing with the door's motion detectors. I've seen that happen a few times with ill-maintained automatic doors.

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[–] guinness2 [S] 0 points 1 points (+1|-0) ago 

Yeah, I've seen that too, especially on a windy day... however it's the reflections in the window that appear at 0:50 which are noteworthy because they don't seem to have an explainable source.

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[–] Skyrock 0 points 1 points (+1|-0) ago 

Ha, I didn't even notice that.

I think it is just a reflection of something on the street outside of the camera's LOS. As you see in 0:20 when the man leaves, the exterior side of the glass is very reflective.

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[–] guinness2 [S] 0 points 0 points (+0|-0) ago 

Broken Video Link: Here's a working alternate link to the video.

Unfortunately I couldn't find any more copies of the original without the cheesy Japanese voice-over.