There is nothing

On my way back from work. For a chance I am driving down Rhode Island Ave. On the downhill right after the Carmelite place. I'm not sure how it happened. All I know is that I was stopped a the light and then colliding with the car in front of me. A white car with licence plates in Maryland. We both stopped and I see a woman getting out of her car. She looks really annoyed (and I can't blame her, I just collided with her!). I put my distress signals and walk to her, looking at her car. There is no track of the shock. It was quite a mild shock (I was stopped after all) so I am not surprised but still not quite sure of what she is going to do.
She looks at me and I say "There is nothing on your car. My licence plate is bent but nothing on your side". She inspects her car. Some marks here and there but I'm not sure these are from the shock. Probably there before as she does not point to them. She smiles. "I was so worried" she said. I smile back. "I'm not sure how it happened and I was worried too". She walks back to her car and wishes me a nice evening. I go back to my car and we both leave.
An incident handled with civility in the country of lawsuits. How refreshing...