Naruto's ninja way is to never go back on his word. Naruto is seriously injured by Kabuto and hovers on the verge of death.
In other words,
if I'm to kill him…
...بعبارة أخرى، إذا أردتُ قتله
Also werde ich es töten. Und zwar jetzt.
Tendré que matarlo ahora.
Tendré que matarlo ahora.
Quindi, se volessi ucciderlo... 
dovrei farlo ora!
Em outras palavras,
se eu quiser matá-lo,