Bystander effect

It was a normal thursday, when I was wanting for the bus to go to school. Suddenly I was shocked by a woman scream. I was about 30ft from where I heard the scream and I really didn't know what was going on. Before I knew it, I saw two guys run pass me holding a bag. I walked down to to the woman and I saw blood every where. Afiard I looked around and thought to my self, how come no one helpped her? So many people was right next to her and let it happen. As people called the police, I thought about the fact that nobody wanted to get involed. Who's to say this guys won't do the same thing to me, all I wanted to do is get far away from there. As I left the scene I prayed she would be okay, and was thankful it wasn't me.