What's the etiquette when it comes to helping people on the trail? Would you intervene if you knew someone was getting themselves in trouble... how pushy would you be to help a stranger, that doesn't think they need help?

Reverse roles - you've been thinking about this day for years and nearly all of your free time for the last 6 months has been used to prepared for this day ... how receptive are YOU to help? If a stranger said that you needed to turn around because you were showing the early signs of AMS/hypothermia/etc, would you?

This happened 7 years ago and I still think about it:

An Unintentional Whitney Summit, a Helicopter Rescue and the “AMS Lady”