Tomb Raider -
Then sneak up on the second one and do a stealth kill. You can use the campsite now. If you have the competition bow at this point then I would suggest you get the penetrating arrow upgrade. The competition bow is an upgraded version of the compound bow.
Penetrating arrows go through armor. So if you're up against fully armored enemies shooting their heads will still kill them like when they don't have armor. That's pretty useful later on.
You'll also receive another entry in Lara's journal as soon as you sit at the campsite.