They enter a sunnier zone that consequently is snarled by much heavier undergrowth, and are forced to break out the machetes and hack their way through to the river. Enoch Root explains that this is a place where a small lahar, which had been funneled between the steep walls of the river’s gorge farther upstream, spread out and mowed down a few hectares of ancient trees, clearing the path for smaller, opportunistic vegetation. This is fascinating for about ten seconds and then it’s back to the machete work. Eventually they reach the edge of the river, all of them sticky and greenish and itching from the sap and juice and pulp of the vegetation they have assaulted in order to get here. The river’s bed is shallow and rocky here, with no discernible bank. They sit down and drink water for a while. "What is the point of all this?" asks Enoch Root suddenly. "I don’t mean to sound discouraged by these physical barriers, because I’m not. But I’m wondering whether you have worked out the goal of it in your own mind."