Hogwarts: Break off the engagement at the beginning and marry Hermione at the back end

First of all, Malfoy was used in front of the people of the Snake Academy, and Slytherin basically all students would have one or two hands of dark magic, which is explained in the original book (for example, Goyle or Crabbe's fire spell is a family tradition, of course, he is too stupid to light a fire and not extinguish himself to death). So for Malfoy to use the Unforgivable Spell, the people of the Snake Courtyard were scared, but they certainly wouldn't be loud-mouthed.

Secondly, in the official showdown between Braun and Malfoy.

Both used normal magic and did not use the Unforgivable Charm.

I'm afraid of being questioned by the Ministry of Magic.

There is also the point that the unforgivable spell will go to prison, which is actually not very strict, such as Barty Crouch Jr., who pretended to be a mad-eyed man who once cast the Imperius curse on a spider in class.

Before the Harry Potter Wars, the older students also cast the Unforgivable Curse on the younger students.

Finally, thank you very much for your question.

Must be refined