I managed to get through the rest of the level and beat Act 1 boss. I still have not been able to get my RPG but hopefully I can in the next couple of levels.
Alright! It was tough as I had a hunter alien on my heels the whole time, but I was able to reach Nicole, who was attached to the Marker. I defeated her (eventually) and made my escape with Ellie. What a cool game. Final boss and game ending! Great stream!