The common rule throughout the US is that individuals are not breaching a duty of care to come to someone's rescue if another person is in need of help. However, once any form of aid is rendered, that rescuer can be found civilly liable for any physical harm caused to the person they are rescuing. 

If you saw someone in a burning car, would you call 911 to report the scene or would you call 911 and then attempt to get the person out of the car? If you were the one rescued and in the process of being dragged out of the car, you suffered irreparable injury to your back that resulted in a lifetime of nagging pain, would you sue your rescuer?