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I have never heard that causality slows down in a medium. I understand the use of "speed of causality" to refer to the speed of light in a vacuum, and while I'm aware that light slows down in air, water, etc I'm not sure it has ever been shown that causality itself slows down. My understanding is that also light slows down just because it's captured and re-emitted by other particles. Though I would be happy to learn something new if my understanding is wrong.
That said, the OMG particle stuff was very interesting, thank you for sharing.
Good point, I think you're right. I've probably been making an unsupported leap in logic there.