that particular scenario, im afraid the best i could do is call the emergency services, but i would definitely do that.
i try to help whenever i see that its needed, even trying to help hedgehogs and stuff. when it comes to people, sometimes i wish i was more powerful but im a small, weak girl so unlikely to be much help to anyone.
that said, i just finished my mental health first aid training. so if there's an emotional or mental health crisis, im on it! ;)