After a short cutscene, it is time that you went to the threatened village. Shoot an arrow towards the bundle of ropes at the other side and zip down the line.
When you start your journey to Jacob, the Trinity launches its attack on the village. At this stage, you are helpless and simply run towards the marker that you can see in Lara's instinct.
You will be slowed down here by the swampy area that you have to cross to get to the village. Unfortunately, this will take long enough to allow the soldiers of the Trinity to deal with the villagers partially. As soon as you reach the village, you learn from the cutscene, that soldiers are looking for the Atlas.