Kakashi holds on to the hope that Obito can return to being the young man that he remembers. But Obito has abandoned the present as well as the memories of his friends and will not try to stop the Infinite Tsukuyomi. Realizing that nothing more can be done, Kakashi comes to a decision to protect the world, while his former friend is determined to end it!
Then why do you work with Sasuke?
إذًا، لماذا تعمل مع ساسكي؟
Warum ziehst du
mit Sasuke an einem Strang?
Así que seguirás con 
Sasuke, haga lo que haga.
Así que seguirás con 
Sasuke, haga lo que haga.
Allora per quale motivo hai deciso
di collaborare con Sasuke?
Então por que você
é aliado do Sasuke?