if the person decides to help the injured party but in his ignorance moves the injured parties' broken leg and causes a much greater injury, he could be liable for that extra injury. As a volunteer rescuer, the person has an obligation (not affirmative) to refrain from carelessness causing extra injury.

Does Michigan not have a "Good Samaritan" law protecting those who stop to help another? I know there is such a law in several states. Missouri & Arizon for two. I understand that in some states it applies only to physicians. Any insight on this?