1. Other than for legal authorities, who do you stop for?

Nobody. In some circumstances, I might avoid legal authorities as well. Legal authorities will funnel people towards mass evacuation routes or shelters, both of which will be quickly overrun and useless. For at least the initial 72 hours, I would prefer to be self-sufficient and avoid the hysteria, pandemonium and potential dangers of being a "have" in a sea of "have nots."

2. What is your response to those who want what you have?

Your choice: 9mm or 12-gauge.

3. What protocol do you follow with those who want to join you?

All others are considered a liability until proven otherwise. If you appear rational and non-threatening, and can convince me you are sufficiently self-reliant, (both in terms of physical capabilities and supplies), there are benefits to larger groups (within reason) and you are welcome to join. But there will still be one member of my "tribe" on watch at all times to avoid problems.

4. Where do you draw the line between looting and foraging for a resource you decide you need?

For the most part, foraging is gathering consumables while looting is taking property. Food, beverages, clothing, fuel, medicine and other supplies would fall under foraging. Cash, coins, jewelry, electronics, etc fall under looting. Things that blur the line are transportation and tools.