This relates to the fact that the audience do not see who set the fire, like only half the body is shown here. This also relates to the two-faced aspect of the leading character on a serious level and their evilness.
Hello, I, am Zerina. I am the child of the devil. I keep evil the power of the world. God tried to take me. That's why I look like I do. I can look like a regular teenaged girl. But I am a demon. I have a crush on a human named Phil . Introduce. If you dare