You'd have to be a real Harry Potter scholar to remember what those spells do, but I've written their effects down in the transcript.

Transcripts help make the story accessible to as many people as possible. This is obviously useful for people who are vision-impaired and can't see the image at all, or people who can see the image but can't read the text in it. But that's not the only group who can benefit from transcripts. They are also helpful to people who have trouble interpreting the language of comics that I'm using – e.g. which things happen in which timeframe, what is dialogue and what is thoughts, and so forth. You could have trouble because you're unfamilar with the medium, or because of cognitive differences, or because I drew things in a confusing way (which I can't deny will happen sometimes).

Because the transcript has many different possible uses, I try to make it explain all the relevant information from the image. A lot of websites have transcripts that repeat the words drawn in the image, but don't describe the pictures. I believe that it's important to include both.

Of course, since this is a work of fan fiction, it has a lot of implicit references to things from the Harry Potter universe. I can't reasonably explain all of them. I will generally try to explain things in the transcript if they're obscure enough that a fair chunk of Harry Potter readers won't know them. This includes information from the later books in the series, because I've met a bunch of people who have read the first book, or the first few books, but not all of them. I'm not trying to make the story entirely accessible to people who haven't read Harry Potter at all, but I want it to be as accessible as I can reasonably make it. And for the things I don't explain, most things from the Harry Potter universe are possible to look up on the Internet.