Chapter 28: I wonder what happens if Harry realizes he's living in fiction, and everything he's dealing with is made of concepts rather than atoms.

Which leads me to think about the people who say that if they found they were living in a simulation, they'd try to get out. Unless the simulation is very similar to the substrate, would it be possible to get out while remaining yourself in any sense?

Back to the story: This might be an argument for checklists: Harry and Hermione should review precautions before they try anything new, should they be doing it without adult supervision. It's possible that the adults should be doing it, too.

However, the story is a good reminder that it can be hard to remember the relevant thing, even if you're very smart.

I don't think Hermione is over-reacting-- remember that they're doing stuff which is not just more potentially dangerous than children that age are permitted to do in our culture, it's more dangerous than what most adults do.