>>714294674 (OP)I would simply walk away. That's the correct approach when being mugged.
The mugger wants to scare you into giving him your things. To do this he threatens you. However he will not follow through on his threat. It's simple game theory. Harming the victim significantly increases the police response, increasing the chance he is arrested and increasing the length of time he will be locked in prison.
The calculus that led to his decision to rob me has changed. The increased costs of the punishment outweigh the benefits of taking the items.
The reason you hear about people being harmed by muggers is because they tried to fight back. Of course this forces the mugger to fight and so it is always a bad idea.