Would You Step Over a Body?

My friend Karen is a young, beautiful, well-groomed, dark-skinned Hispanic woman. She went to the local Library last winter and slipped on a patch of ice at the entrance, just as the library was openning. She hit her head so hard, that she actually lost consciousness for a short time. When she came to, people were stepping over her limp body to enter the library. Dozens of people saw what happened and not one person stopped to assist her. Though dazed, she was able to pick herself up off the concrete and go about her day. But I can't imagine why no one would help her? I can't imagine a single person who would literally step over a limp body. Good thing she didn't collapse in the middle of the street! There are very few black people in the city in which I live, and she certainly could pass for black. Do you suppose prejudice had something to do with this? Or was it simply a case of monkey-see, monkey-do? Did the first person who encountered her want a special spot in the library so bad that they left her care to someone behind them and each passerby just followed suite? Either way, I was appalled!