Being touched when I was 12yo

So, it was a hot afternoon and I just arrived home with my mother. My mother has a grocery-store and I sit down and quietly play there alone. Suddenly, a man come in and greet me ‘hi!’ Asking why I didn’t go out and just play alone in the house. (That time, there’s news about high school girl being raped and murdered. My mother never allowed me to go out of the house without her) He asks me to go out and play with him, his hand touch my thigh and rubbed it slowly. I’m afraid and almost cry for it. But then I screamed at him, asking him to leave.