After being seriously injured by the Nephilim, Hibiki is unable to control her Symphogear.  She flies into a rage, destroying the Nephilim and ripping out its heart.  During the post-fight medical exam, it's discovered that if she continues to use her gear, she'll die.
a weakling who goes out of control
أنّ الضعيفة التي تخرجُ عن السيطرة
dass ein
randalierender Schwächling,
una debilucha que pierde el control
che non possiamo fidarci di una deboluccia