You both sound weird.
tell the school authorities what you witnessed...immediately!
pycho stay away
Good or bad, in the world, as far as I know, you can't prosecute someone for what they might do.
If you believe that you have mental health conditions, you should see if that is where your fears are coming from.
I suffer from extreme anxiety, and only go outside my home for several hours per week. I am still waiting for meds to help with this and have recently started counseling.
I hope that you are able to get and imbalances in your life resolved and have a happy life ahead of you.