Fitz blames himself for the monster Aida has become and agonizes over everything he did in the Framework. Simmons tries to get him to use that energy to help her find a way to kill Aida once and for all, but Fitz looks hesitant and Simmons isn't happy about it. 'How do we kill her? Do you want to kill her?' she asks. Watch this sneak peek from Marvel's Agents of S.H.I.E.L.D. Season 4 Finale, Episode 22: World's End airing TUESDAY 10|9c on ABC.