Geothermal Valley - Occupied Village Upper Level (Part 3)

Move around to the front left corner of the cabin.

Climb the tree and jump onto the roof of the porch where you shot the second guy at the start of this encounter.

At the left end of this little roof is a hole where you can see into the building.

If you wait a moment, one of the 2 men below should step closer to his companion.

Then you can kill them both with one poison arrow.

At this point there should only be one enemy left, so stealth is no longer crucial. However, if you have the Finesse skill, you'll receive bonus XP for chaining stealth kills. So drop down onto the front porch...

...and move around to the doorway.

The last guy is usually just inside on the right. Sneak up on him while he's checking Facebook and take him out with a melee attack.