Harry must know SOMETHING about the Heir of Slytherin surely. Although Pansy didn't know. Maybe I paid a little more attention to that sort of thing because I was the first in my family to be Sorted into Slytherin so I did a little extra reading.

But anyway Slytherin's heir was supposed to get rid of all the mudggleborns and the Lord Protector DID that so why would anyone

I don't understand but it makes me worried. Actually everyone in Slytherin seems a little worried right now even though most of them are pretending they think it's excellent and they don't mind at all, kind of the way everyone acts when Draco talks about his Aunt Bella.