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.
And this seems to be exactly what Dumbledore himself does. That is a lesson I hope we see Harry take on board for future experiments.
And this seems to be exactly what Dumbledore himself does. That is a lesson I hope we see Harry take on board for future experiments.