I've been waiting for ages to hear what you have to say about timelines! I wrote out my own impression here--

[She's quickly sketched on paper in green pen, which she moves the camera from her face down to show.]



Basically to the effect that we leave our own timeline, go to a new timeline where we change the past, and return to the future of that altered timeline, with the goal of the last change leading us to the alpha. I'm not sure how wishful that thinking is though.