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[OngBonga]

It also has to be taking you to another dimension, or teleporting you, because if you walk behind the portal there's no obvious place where it's all happening. I'm less inclined to think that teleportation is possible, seems like that's severing your body as you walk through. It's kind of important to still be in causal connection with the rest of your body as you move through the portal. Instant teleportation might be possible, but you can't instantly walk through a portal.