: As an "Echt" (pure-blood) Quincy, Masaki possessed powerful defensive abilities ( Blut Vene ) that would have easily defeated Grand Fisher.
: To save Masaki, Isshin Shiba (the 10th Division Captain) agreed to be bound to her soul using a special Gigai. This required him to permanently sacrifice his Shinigami powers to act as a counterweight to the Hollow essence within her.
: On that specific day, Yhwach (the Father of the Quincy) performed the "Auswählen" (Holy Selection). He forcibly stripped "impure" Quincy of their powers to restore his own strength.