I am a GM and I have this problem. My gaming group (and some NPC) is shipwrecked on a desert island. I'd like the characters cooperate to survive in this hostile environment, because I want to make the game world really dangerous (so the have to cooperate or die).

But two players (two "lone wolves"), once landed, have broken away from the group, entering the jungle.

Now, I have always encouraged the betrayal and division among the players, but not so soon. If I offer to these "lone wolves" challenges appropriate to their abilities, they hardly feel the need for a group. But if I do otherwise, they will likely die at 1th level.

Furthermore, I will have to tell two stories in the same session.

Anyone has any suggestions? I have to force the meeting of the two groups or leave the "lone wolves" to die in the jungle?

(BTW, the game is Pathfinder, but I don't think it matters for the question. And please sorry my bad English.)