[He had no idea how to explain this nicely, and he sighed.]

Every shinobi knows that every mission they leave the village on might be the mission where they don't come home. We do the best we can to keep it from happening. Teamwork is -everything-. Your team relies on you and you rely on them, and that means that sometimes it's super hard if you lose someone. But it means that nobody gets left behind, and no one gets forgotten, see?