Stayed up to late playing this thinking I was coming towards the end
Just checked on a guide and I'm only about two thirds of the way through.
That whole sequence was something that most games would climax with, so can't wait to see how it does end. I'm really enjoying this. At first i found it revealed in Lara's misery and suffering a bit to much, but what it does do (which Uncharted never managed) is to give her motivation behind all the killing, and makes her journey into slight madness quite believable.
It also controls fantastically.