ok so zero starts thinking back to why he probably can't kill yuki. he remembers how when he use to hurt himself she would always be there. he starts to realize he has feelings for yuki as well. seeing kaname with her it gets him angry, he then smells yuki's blood [after accidentally hurting her] and realizes he has changed.he wants to become stronger and fight his inner self. yuki tells him she is not scare of vampires [since she was saved by kaname] zero almost tells her that he is one but doesn't. and he knows that yuki has always been there for him.

When the chapter showed a bit of Kaname, there was a black line or some kind of stuff (maybe blood?) that attached itself to him. Was it Rido or what's left of him?