The one who killed the girl was a vampire hunter. He discovered the girl's vampire nature and loathed her actions of constantly defending vampires. His lover was drained of all her blood by a vampire, leaving behind a three-year-old child to live with him. Therefore, he harbored a deep-seated hatred for vampires.
Upon seeing the girl with vampire fangs, he was convinced that she was a spy for the Blood Clan and that everything was a conspiracy. Thus, he vented his hatred by killing the girl. However, the dismemberment was not done by him, but by other humans who also hated vampires.
