I would have to weigh the circumstances very carefully, and determine if the person was acting in a reckless and dangerous manner. I MAY sue if it was some hothead who decided to needlessly throw lead in my direction. I would NOT sue if it was a good shoot, unavoidable, and fate saw to it I caught one when a good citizen did the right thing.
One of the reasons this country's legal system, and by extension our society, is as jacked up as it is, is because of folks and their ambulance chasing lawyers lining up every time there is a chance at personal profit at the expense of somebody doing their job, OR the right thing, OR having and honest, out of their control accident. I understand the insurance companies going after each other, I am talking about individuals seeing a chance and grabbing some poor schmoe's house, car, savings, kid's college fund etc. and running for the bank like they deserved the money. Like they have a right to kick a guy and take his wallet when he did the right thing in this instance.
Being able to look myself in the mirror and be OK with what I see is something I value. Something to ponder.