remember in Naruto when they first encountered Zabuza, and Kakashi reassured them how he would not allow his comrades to die?
he said this to Sasuke with a smile on his face. but we all know that he was dead serious..
Naruto: "I'll never let a comrade die" (ten tails attack) *Naruto tries to protect everyone.* Obito: You'll never let a comrade die?... Look behind you. This happened about five years later during the great ninja war. Naruto tried to apply the same lessons. And we all know the outcome was a bit different. He did save a lot of comrades, but he also lost many. I don't know why but this really hit me in the feels.