@Nk9bjP4A, if you're leaving with your parents tell them to call the police and don't get close to him and don't make it oblivious that you know his unnatural behaviors, act like usual and don't look too much in his face, if you leave by yourself leave the area and call the police after moving on so you don't get in trouble if they don't find anything out or if he run away. Please be safe and don't act like a hero if you're not strong enough and especially with this kind of person he maybe crazy and mentally unstable and it's impossible to reason with them
May God be with you