When you see someone by the side of the road / trail with mechanical or health issues:
Don't ask "Do you need Help"
Say: "Do you have everything you need?"
Don't directly explain how to fix something or use a tool, but you can lighten the mood by saying "If you'd like me to mansplain that you just tell me to".
Lots of people are learning or new to on the road fixing stuff. They also may not know their limits or get into dehydration or heat stroke. So keep an eye out to improve their experience.