On the brink of defeat, the Gundam Meisters have been rescued by the intervention of Celestial Being's second team. Their rescuers identify themselves as Johann, Michael, and Nena Trinity, the Meisters of the mysterious Gundam Thrones.
...took independent action in that matter.
تصرّف بشكل مُستقلّ في هذا الصّدد...
bei diesem Vorfall eigenmächtig zur Tat.
actúo de forma independiente.
actúo de forma independiente.
agir por conta própria, 
sem avisar aos outros.