THIRD PERSON'S POINT OF VIEW
The witch can see how they tried to fight each other. Their powers have gotten stronger. As for Amerah's body, it was really controlled by rage but her soul is not coming back. Yuri is fighting for both of them, she needs to keep Amerah's body out of scratch or getting hurt. On the other hand, she is the one who is suffering because of her own will to save her friend.
"Getting tired already? I am just starting to warm up!" Vernon is provoking the girl to fight more seriously until her body drops out of power. "I can't quite see your willingness to survive the wrath of your friend. She is not cursed for nothing, for sure her powers came from a sacrifice to give her the privilege to kill herself before her soul gets out of control." Yuri pretended that she is not listening to what Vernon is saying. His words are like poisons that enter her brain and manipulate how she thinks.