Sergei started to get serious this time because the werewolf had turned into a killing doll in front of him. He also couldn't just let the dark forces turn into a werewolf puppet. He also believes that soon the evil power will turn humans and vampires into tools that can easily control.
The werewolf howled, and he had already targeted Sergei. His eyes were pitch black, and it was clear that he couldn't control his thoughts anymore. The dark power had utterly overpowered him and ordered him to kill the vampire in front of him.
The werewolf's sharp claws gave off a dark aura, and it made the poison in the cuckoo stronger so that it could weaken a vampire as strong as Sergei. However, it is dangerous for a vampire who is only ten years old even to kill the vampire's life.