Plot hole: When Umbride is about to use the Cruciatus curse to interrogate Harry towards the end of the story missions, Herminone says "Tell her. It's not worth another student dying." No students had died (not since Cedric Diggory anyway), were threatened with death or were in any kind of fatal situation yet. What is she on about?
Suggested correction: Exactly what she means. Cedric Diggory is dead so it's nothing worth Harry to die over.