There are shots of Jean unleashing the alien life-force, which also invades Xavier's Cerebro, that device he uses to amplify his powers. We then get a good look at a late second-attempt to ‘save' Jean, which somehow involves a train and Magneto (Michael Fassbender) foolishly threatening Jean's more confident personality, Dark Phoenix.
Right after the Mystique shot, Xavier notes that “she will kill us all”, which then divides the X-Men: some naturally want to save her, while others are convinced she's not Jean any more. It's not like the new trailer leaves it too ambiguous, though. Though the trailers are still teasing it, writer-director Simon Kinberg has uselessly already confirmed that Mystique will die in the movie. This is where the moment from the previous trailer comes into play, as Mystique's attempts to calm Jean prove too dangerous for her. Chastain's character explains the alien power “destroyed everything it came into contact with, until you.” She then takes her manipulation up a notch, putting words in Jean's mouth, who starts to believe that the other X-Men “fear and seek to destroy her”. Jean says she's losing control, which leads to “bad things” but “feels good”. Cyclops (Tye Sheridan) tells her that the young mutants at the school are calling her “Phoenix”, who then meets a new alien shapeshifter character (Jessica Chastain).
