On the one hand, Harry and Hermione find out that one needs to know what a spell does in order to cast ist successfully (Ch 22, “If you didn’t tell her at all what the spell was supposed to do, it would stop working.”).
And then in 26, about the 6th years Griffindor (canon!Harry) who hexes canon!Draco: “He is in his sixth year at Hogwarts and he cast a high-level Dark curse without knowing what it did.”
Shouln’t that be impossible? Or if the knowledge from Harry and Hermione’s experiment wasn’t very general, Harry should have noted at least. (Though honestly I didn’t notice during my first read, being amused about the reference to canon).
The next line after “If you didn’t tell her at all what the spell was supposed to do, it would stop working.” says
If she knew in very vague terms what the spell was supposed to do, or she was only partially wrong, then the spell would work as originally described in the book, not the way she’d been told it should.
Knowing that the spell is ‘For enemies’ apparently counts as knowing in very vague terms what it will do.
There seems to be a slight contradiction.
On the one hand, Harry and Hermione find out that one needs to know what a spell does in order to cast ist successfully (Ch 22, “If you didn’t tell her at all what the spell was supposed to do, it would stop working.”).
And then in 26, about the 6th years Griffindor (canon!Harry) who hexes canon!Draco: “He is in his sixth year at Hogwarts and he cast a high-level Dark curse without knowing what it did.”
Shouln’t that be impossible? Or if the knowledge from Harry and Hermione’s experiment wasn’t very general, Harry should have noted at least. (Though honestly I didn’t notice during my first read, being amused about the reference to canon).
The next line after “If you didn’t tell her at all what the spell was supposed to do, it would stop working.” says
Knowing that the spell is ‘For enemies’ apparently counts as knowing in very vague terms what it will do.