Likewise Uhura also arms herself and hides behind one of the trees as cover waiting to see what it could be.
Specific Action: Major stays in his position but hides that he is holding a gun in case they are friendly. He will act like he is looking for insects on the ground.
Specific Action: Likewise Uhura does not move but also pretends to be looking at the tree she is behind for something but she does not keep her weapon too far away if they should be attacked.
Specific Action: Major stays in the same position but looking in their direction only slightly. He wants to think they're friendly and if they aren't then his gun is already to fire.
Specific Action: Uhura doesn't move but keeps the same position ready to fire if necessary depending on the reaction of the natives.
Specific Action: Major immediately puts his gun away, stands up and smiles as though he understands what they're saying. He then points to some insects on the tree to show what he is looking at.
Specific Action: in the same way Uhura follows Major's cue and does the same. She then puts on whatever translator the computer might have or use her own skills to understand what they're saying.
Specific Action: Major accepts the offer of the tribesmen and follows them from behind just in case its a trap.