Why on earth would Dylan run away knowing his brother is a murdering psychopath that killed his mother and other people? I'm doubtful Dylan is scared of Norman and if he knew anything about Norman murdering anyone he would likely do something about it. He will be the hero that tragically fails. You can hope all you…

She wasn't exactly being very stern about it though. He was being way too pushy but she could have been like "NO THATS ENOUGH" and just let him continue.