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In the first half of Tenet, there is a scene where The Protagonist and Neil break into Freeport and find a glass wall with bullet holes (could only find a good photo with Christopher Nolan in it):

characters standing, looking at a  a glass wall with holes

In the next scene, we find out that these bullet holes were caused by an inverted armed man entering the room (exiting the room from their perspective) and reverse-shooting the glass, which removes the bullet holes from the future-facing perspective. This all makes sense, but raises a question: how long were the bullet holes there in the first place? Were they in place as soon as the glass was installed, possibly years ago? Or even back when the glass was manufactured?

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    we should not pick on every detail of this movie or think hard on it. The same question can be asked about how long is the BMW back mirror broken? How long is the inverted bullet embedded into the wall of the Opera house? – Yu Zhang Sep 15 at 22:22
  • I think this would be equivalent to the bootstrap paradox in classic time travel. – John Sep 16 at 16:49
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    This was my first question after seeing the movie. If this can't be explained then the entire movie doesn't make sense IMO – Kidburla Sep 20 at 20:50
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    @Kidburla IMO the movie would make a lot more sense if it wasn't a fixed timeline and every inversion created a parallel universe. But with a fixed timeline it gets a lot more tricky. – JonathanReez Sep 20 at 21:01

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