For many I assume the device provides some kind of space-time anchor relative to itself, so when you go through the magic door it’s already attached to itself on the other end. The “itself” on the other end doesn’t need to be the whole machine, just enough molecules or whatever to lock on to. I like this idea because 1, it still leaves room for error so it isn’t perfect and 2, I can stop thinking about it and enjoy the stupid movie.
For many I assume the device provides some kind of space-time anchor relative to itself, so when you go through the magic door it’s already attached to itself on the other end. The “itself” on the other end doesn’t need to be the whole machine, just enough molecules or whatever to lock on to. I like this idea because 1, it still leaves room for error so it isn’t perfect and 2, I can stop thinking about it and enjoy the stupid movie.