All magic when used is manipulation on some level and thus could be considered “black magic”. Any time you use it to alter something especially.
It's changing the natural course of things. A magician needs to be very conciliatory about this ... luckily, it's not like the movies and some things can only be pushed, pulled, bent so far without pushing back ... other entities and forces out there make sure things flow a certain way ... a magician pushes too hard one way, a certain way and they will experience the pains of the universe correcting itself.
BTW, I looked for forum for chapter 1 but did not find anything, im still trying to navigate and figure this site out.
Aloha