This level had a lot of touch and go. Instant kills by some enemies. I tried to whistle to drag them away one by one. It worked to a certain degree. Poor old Querebos (sp?) got killed but not without telling how to get to the heart of the tree..
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!