—WTH and why didn’t the first person stop.—
Thought it was a deer?
Very possible, given the dearth of info here. Heck, it could have been so “glancing” that they didn’t even know they hit her. Likewise with the other two cars. I’ve run over dead animals in the road at night and not stopped.
Possible to be sure. The deer thing, I know people that have hit deer and get out to throw in the back of the truck.
When my car hits something, anything, I notice that it has hit something, and if I am not crippled from the impact, I often stop the car, and see if there was serious damage to it, or whatever it was that I hit. Damages to your car from an impact can be worsened if you keep it running. Additionally, the fact that I did hit something in the dark is a good call to me that I really don’t know what it was or how much it could hurt me. I hoped that I didn’t hit something alive, but I couldn’t initially know when I was in the nighttime conditions, and the object came right up fast with the speed of the car.
Even if this person wasn’t unselfish, he could have at least, assuming poor visibility, tried to check about his own car.