While everyone is busy with their acting Major will look for a vantage point where he can see the natives and get some kind of idea what they are talking about and doing. He will communicate what he gets through his comm in case he or they are caught.
If Uhura has success then she will pretend she is using her analyzer to look for insects but she will be really checking the composition of the natives and everything on them.
If they attack she won't hesitate to take out her gun and blow them away.
If Artemis's roll succeeds, she'll keep doing what she's doing. If it fails, she'll dive for cover, since she doesn't have anything to shoot with. If the natives charge with violent intent, she will run at the nearest one and try to stab him with her dagger.
-1 bonus for streetwise.
If Artemis is the one that throws everything out of balance then Major will try to make a distraction by emerging from his hideout pretending to be filming with his binoculars. He will have his pistol ready and starts talking to them so Artemis could make herself scarce.
Major tries to get the natives to talk about their necklace and where they got it from if he can get them to show him the way he will follow.