How lovely Elvis! I hope I (or my mum) meet someone that helpful if ever we're in need of help! People are very paranoid nowadays, they won't even come out of their house if you're shouting for help, more often than not. That's why the police advises woment to shout "fire" if they are going to be raped, as people will respond to this rather than "help".
I've never been in that situation, but I know if I saw someone who is obviously in a predicament, I would see what I can do to help. When I was a kid, we live with my mum in a flat at a junction. One night, there was a car crash, which woke us both up, and we both went out (I was about 10). Some w4nker had crached into a car with a lady and her two kids inside, and just drove off. The lady had a cut on her head and the kids were very upset, obviously. Mum ran back into the house and told me to stay with the lady whilst she phoned the police. I held the lady's hand through the car window and tried to talk to the kiddies, who were just a few years younger than me, bless. Mum came back after a minute, and we all waited for the ambulance together. They were all fine in the end, but the mum received a big bouquet of flowers a few days later! :O)