Alexander bit his tongue, as he didn't want to be reprimanded by Charles. He simply returned Blair's smile, pretty much ignoring Juniper. To him, Juniper was still a good-for-nothing Mudblood, and he would probably never change his mind. Charles was pulled away by Mark, and the two had a rather tense discussion about Alexander, which ended in Charles getting a warning [i]expelliarmus[/i] in the face and being forced to leave. Mark wasn't going to have any of Alexander's bs, even if it meant threatening the brother of the troublesome boy.