Team Kakashi are stunned to learn that Sai's true mission is to kill Sasuke.  Naruto wants to believe that the smile Sai showed them was real, but there is a possibility that it was all an act.
He couldn't have been
an easy opponent to defeat...
Ja, und er war sicher niemand,
der sich einfach besiegen lässt.
No debe haber sido un 
oponente fácil de derrotar.
No debe de haber sido un oponente fácil de derrotar.
Non dev'essere stato 
un nemico facile da eliminare.
Ele não era um inimigo
 fácil de se derrotar.
Такой противник явно был не из лёгких...