Responding to seeing the rampaging "Superman" on television, the remaining able-bodied Titans and Young Justice members (and Impulse, who is able to heal faster due to the Speed Force) confront the robot, thinking it to be Superman at first. When Lilith (who has met the real Superman before) cannot sense his thoughts, she approaches the robot, which breaks her neck, killing her instantly.
Upon witnessing the rampaging 'Superman' on TV, the remaining capable Titans and Young Justice team members (and Impulse, who can recover more quickly due to the Speed Force) face off against the robot, initially assuming it was Superman. However, Lilith, who has previously encountered the real Superman, is unable to sense his thoughts and approaches the robot, which promptly kills her by breaking her neck.