Lara has a speech with the man at the village overlook base camp and I am stuck from here. When you run down from there, there is a huge drop and a rope at the bottom. I have looked on youtube and it shows Lara firing at the rope and climbing down. I have tried firing my arrows at the rope but nothing happens and I am running out of arrows. Do I need a special arrow and if so where do I get it? I have been stuck here for ages.