Good thing he has a pistol. That way he can shoot multiple rapists in just a few seconds, before they have time to check his ID.
So you would just walk up and start shooting.
What if you are wrong about it being a rape?
What if the girl is a willing participant?
You don’t bother to find out first, you just start shooting right.
Let’s assume for the sake of the argument you aren’t a senile old fool and you decide to find out first before you start shooting.
Now you’re an 80 yo with a pistol surrounded by 3-4 20 something yo thugs ready to kill you.
Since you sound so thoroughly dangerous tell me how you take all 3-4.
I would love to be educated by a thoroughly dangerous pistolero.