A couple years ago I came upon a crash that just happened, near roll-over in a ditch, tires still spinning, and people still inside the car. I pulled over past them, got out, heart pounding, and really did have the "okay, am I safe here?" thought followed by "calm down good sir". As I briskly walked the block back, wondering what I would even do, the ambulance and police were already rounding the corner, so I backed off. I still wonder what I would do, as I definitely tend to have the freeze response in things like that. The fact that I even stopped and got out was surprising to me.