i think that stage 1, aliens guard a supply crate, humans guard some alien mothegg thing. If humans destroy the "Weeds" around the supply crate, they get s2. Motheregg is in a cage or something, aliens destory cage, they get s2. When a group reaches s2,a door on some other random end of the map is opened allowing for that group to attempt s3. Inside the doors is a base similar to the premade one that teams start out with at spawn. Teams could choose to deconstruct to leave intact their first base intact, (a conquored base would serve no real purpose except survival as there would be nothing to protect after the supply crate/motheregg has been freed.)...