It's immoral to physically harm another person.
Phil is walking on the sidewalk when Aaron who was skateboarding bumps into him and the skateboard hits Phil in the shin painfully.
Phil wants to lash out at Aaron for causing him pain.
Phil screams at Aaron that he's an idiot and that he needs to watch where he's going because he hurt him.
Phil grabs Aaron by the throat and begins to punch his face as hard as he can so Aaron can feel pain, too.
Aaron is immediately apologetic and wishes he hadn't skateboarded on the sidewalk and asks Phil if he's OK.
Aaron is terrified and overwhelmed by the sudden attack and fears for his life as the fists rain on him.