To escape from el gigante quickly, go through the right path. When you enter, there should be a huge boulder sitting on some wood. walk up to the boulder until you are a little behind it. Shoot the chains on the door with your rifle or hand gun. move forward and el gigante will appear behind you. shoot the wood so the boulder wil fall on him. Run. And if you shot all of the chains off the door, you should be able to open the door with a push. This will save you a lot of time.(enough to get the key and open the other doors)