The antagonist killed halex, and threw the sword at piece, who was closer then freak. That could mean that neither piece and ricky are the antagonistI think it's probably red from blood dripping onto the note. My thought is that the clues are in the story, not the notes. According to the story, it was supposedly freak or piece who killed halex, though it could be more complicated than that. Like in Gaiden, we don't know everything about this round...