Even OCing you can be Robbed ! Criminals pick their victims based on your apperance, They look for what they think are easy Victims.
In this case the BG got more than he expected too.
I'm sorry this man was Targeted, and hope he recovers his belongings. You need to be aware at all times of everyone around you. Pay attention to poeple they will give away their intensions with their eyes.
As I have always said, having an weapon does'nt gaurantee your safety. Best weapon we have is our minds, and always expect the Un-expexted. Pay Attention at all times. You can never drop your gaurd.