Whose death do you think was the most unfair?

As I understand it, the Griffin's heart didn't affect Agrail because he isn't a "purebred demon," but rather has "mixed dark elf blood" or something like that?:confused:

So, it turns out that one of Agrail's ancestors was a Demon, and his wife (or whoever) was a dark elf – an interesting pairing. How could Tieru have known this? Well, a family history involving a dark elf and a demon would immediately attract attention. At least, that's how I see it. What do you think?