Hibana and Byakuya were friends. Seeing Hibana express her joy at their reunion with a lariat, Mira is a bit bewildered. Byakuya, who had been told by the messenger that she was disqualified as a magical girl, readily accepts it, though she doesn't want to quit. 
You're on their side?!
‫أنت إلى جانبهم؟!
Bist du etwa auf
seiner Seite, du Scheißkerl?
¿Estás de su parte?
¿Es que estás de su parte?
Tu es son allié, ou quoi ?
Maledetto, sei dalla sua parte!
Você tá do lado dele?!
Ты что, с ними заодно?!