I love the way you portray Snape--he has recognized his prejudice towards Harry, but he is still affected by it--and Harry's staunch rejection of his help, though I feel so terrible for Harry, who feels he must deal with his problems on his own. And Draco, who is both very aware of his deepening feelings for Harry, and completely clueless at the same time...Loved this chapter!
p.s. What is Seamus doing during meetings of the DA? *slightly nervous*