The mouse becomes very pepped. Not dangerously so, but in a way that noticeably exceeds the strength of the dose.
"That's interesting! And it makes a kind of sense, as a side effect of sort of doing the same magic twice on something. I have no explanation for the glow, though. The glow was weird."
"I'm not sure. I wonder if it just... couldn't think of anything better to do? But I'm not sure my magic actually works that way... I'm not sure what sort of a way to work that is."
"Mine can learn things. Maybe it sort of knew what things witchcraft does, and making the pep potion stronger was the first thing it could do that was like something witchcraft does and hadn't already been done by real witchcraft?"
"I have no idea if my magic can learn which things it's appropriate to strengthen," says Matilda. "But now I want to find out!"
"Well, there's time to think about it," says Matilda. "I don't think it's very important to find out in a hurry, since I can still do regular witchcraft without any of my magic in it."
That's interesting.
She goes and finds Lavender, who turns out to also be glowing, in a different and less excitable mix of colours. She explains some of what's going on. She teaches Lavender some very simple witchcraft. Lavender makes several batches of elixir base using Earth-witchcraft. Matilda can see her do it, just as though the analysis was still active... except that the colours of the analysis weren't quite this clear, didn't have quite so much detail, didn't have the feeling of magic attached that is now becoming very familiar.
Matilda arrives for her next lesson with several batches of Earth-brewed elixir base and some exciting news. "My magic learned your analysis and now it can see itself!"
"I don't know! Maybe! It's exciting! And I think it's been learning to see itself better since then; I can already tell more things about when Lavender is flying or someone's making potions. I brought some batches of elixir base made on Earth for me and Raha to test."
"I guess this time it didn't feel like it needed to do anything extra," says Matilda.