marion hedges, beating the odds. this surveillance video shows the moment of impact outside a target in harlem. two teenagers pushing that shopping cart off this parking garage, smashing into marion, 50 feet down. she collapsed in a heap, as her 13-year-old son watched. at the time, mere survival seemed unlikely, let alone this sidewalk interview taped monday. >> a little makeup and hair helps. i'm doing one day at a time. i don't have eyesight out of my left eye. no vision. so my optical nerve was damaged. so it affects my walking. i only have one eye that works. so i have to -- it's hard to see close or far. it's a work in progress. >> reporter: marion was here buying candy for needy inner city children when it happened. before the accident, she was a well-known social activist. but on this day, halloween day, 2011, these two teenagers, in the very neighborhood where she volunteered, dumped a cart as a joke, a prank. >> what about the two young boys who did this? >> i had nothing to do with that. so i am only focusi