Y'know, ,once the full truth about what's going on in Slytherin gets known by Daphne and Hermione, I can see them making it public knowledge in such a way that a horde of witches from the other three Houses descends on Slytherin to succor and avenge their sisters. 'Twould not be a good time for 'most all the males in Slytherin (there -might- be some innocent firsties, but I doubt too many more than that).