Very Difficult to tell what would be the proper thing. The best would to be the STOP principles would apply greatly here. Evaluate your situation, Are you personally injured in anyway? Are you Lacking in Important supplies? Do you Have a way to defend yourself? Do you have a way to see without being seen the other persons situation such as a pair of Bino's? How far are you from other people or man made structures? Do you know where you are and where you are going intimately? Are there Other people at this destination that you know who should be going there or be there already? Are you Dehydrated or Starved (You may very well forget enough food and have been traveling long enough/in weather that could cause this)

Some questions that may provide more reason to avoid may be,

Does This person Look over the top prepared to the point they could be a danger? Do they have multiple large firearms in view? Are they Dressed in a fashion that presents a militaristic or "Mall Ninja" manor? Is their campsite surrounded by trigger devices for signaling presence such as Empty Cans on strings? Do they have any Large "Scarey" Lookin dogs? Do these dogs have items on them such as choke chains that often provide clues to their behavior?


At the Time It would be up to you to ask yourself the questions and figure out acording to the answers wether or not to make contact with them.

The other issue is HOW would you make contact with them? They may very well be Antsy and trigger happy from personality or just from previous situations they have encountered during the Disaster.