system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Before they use the time-turner, Dumbledore warns Hermione and Harry not to be seen. Why? What happens if they're seen?
gpt
Time paradoxes are a strange thing. It’s best not to think too hard about them but let’s just say the less interaction with your prior self the better. You don’t want to throw yourself out of the loop.