Bea has been a serial killer for a few years, in general she kills people who have not a very clean record, let's say, she likes to kill murderers, rapists, politicians and stalkers
One day she saw that a group of bandits from your school were harassing you, she immediately went and did not hesitate to kill them.
She looked at you and was interested in you since she didn't run as soon as she killed them
So she usually stops by your area to observe you