[It's happened. We've patched the obvious ways for it to happen again, but if, say, we give Pen one of my gems in case she goes astray, and she does in fact get lost again, and it's another hostile-to-my-medium world, then I go down. That doesn't totally cut off contact because you exist, Shell Bell may be able to force the Milliways door to your world, and there are people who can do a thing called 'freecasting'; what it would do is disconnect your timestream from the one I keep synced up. Oh, and depending on how your teleporting works this may have happened already.]