Touya and Minori and the rest of the players in the training camp are hitting a wall with the way they fight.  And Minori's suggestion is that they introduce themselves to one another!
So that's why...
Verstehe. Das ist der Grund.
Así que eso era.
D’accord, je vois…
Ah, ecco...
Era isso então?
Так вот в чём дело!