I was all prepared to kill Laura in Chapter 10 last night. I had already upgraded my Harpoon Bolts to level 5 for the fire effect. So when I got there I was going through the usual deaths, prior to the kill, but what happened next was totally unexpected. When I came back at the checkpoint, Laura failed to spawn. This was in the last area, so I was literally free to just walk around at my own leisure and pick up ammo. I dropped down the hole and gathered everything there, pulled the lever, and strolled right out of there.
I'm on Nightmare, so when the game gives you a free pass out of the big Laura fight, you take it. You take it every time and thank the game profusely (even if you were going to kill her). That's my philosophy, anyways
It was great having so much ammunition and supplies for the Amalgam Alpha fight. I basically tanked it, haha