After I killed the Warrior his dead body is between the green button and me and I cannot press the green button to call the Moon Shot to finish him off. I can see the green button but there isn't any dialog. How can I end the game and kill Jack?
As BenBrocka pointed out, quit your game (ie exit out of the menu), and load your game again. You'll continue the game from the same arrea as the fast travel before the Warrior fight.
All credits go to BenBrocka
Also, additional tips from the gameFaqs forums: