Du'kki Island was vast enough that hunters of different ranks and numbers populated the place. Companions being top of the list to be gone missing. Most of them never returned, some did return, but only the hardened will to have the guts to return to the island.
Lost Companions were common occurrences, the second was the Hunters. Although valuable, most of the Hunters ranking below gold was neglected. Being a Hunter was lucrative indeed, but the Hunter's Guild Association wouldn't spare to much of resources to look for the missing. Especially if the hunter weren't even at the top of the list.
And Sasani wasn't even a Hunter, she might be a Companion herself, or joined a party of Hunters to gain experiences under the mask of Swift. She might be a porter like Ned, a runner, or perhaps a looter.
But now, it doesn't matter, the group of well-organized beasts were after them. And luckily, Twali was a servant willing enough to risk his life for his lady.