With the students of F-class defeated, their beautiful teacher, Beatrice, rises up to protect them and fight the apostles assailing the academy.
I remember them saying 
they're Machine Siblings.
Ja, das waren die
Maschinen-Brüder, oder so.
Il me semble qu’ils ont parlé
de confrérie des machines.
Mi sembra abbiano detto
 che sono del turbo del Re demone.
Se não me engano, disseram
que são os "Irmãos Machine".