If someone's in trouble, help them.

My mum once told me a story about her friend. She was being followed in the underground, London.

She tried getting away by going on multiple different trains, but this man just would leave. Like any other person she started getting distressed.

She was running through the underground crying with a stalker hot on her heals until someone saved her life.

This person had no idea who she was but helped her anyway. This random person pulled her into a hug and said.
"I haven't seen you in so long. How are you?" Pretending to be family, the stalker walked off.