You avoid the caravan, which pays no attention to you whatsoever.
You avoid the caravan, which thankfully does not spot you.
The caravan is definitely unfriendly and upon spotting you, chase you across the desert, fatiguing and injuring your camel.
They catch up to you and steal some of your supplies.
You approach the caravan, which turns out to be friendly.
However, the caravan is neither travelling in your direction nor do they have any extra supplies to give you.
They happen to be travelling in your direction and invite you to join them for a while. You and your camel find the travel easy going.
They aren't travelling in your direction, but they do have some extra supplies to spare, which you eagerly accept.
What a stroke of luck. The caravan is not only travelling in your direction, but they offer you some supplies when you part ways.
As you approach the caravan, you quickly realize that they look most unfriendly. Fortunately, you carefully avoid them before they get a chance to spot you.