Puella Magi Madoka Magica 7

Don't do it again, BLUE HAIR!!! This isn't a thing that I want it to be. While the scene displays above, RED HAIR seems to be stabbed by the angel appeared from Sayaga(I don't know what it really is!~). There is an evidence that the RED be eaten earlier than the BLUE. It is obvious that QB(Kyubey) is obsolutely an evil demon... AND why BLUE HAIR is getting darker???