The episode centers on the aftermath of Haku’s sacrifice. He throws himself in front of Kakashi’s Lightning Blade to save Zabuza, ending the life of one of the series' most nuanced "villains."
His initial refusal to mourn Haku creates the episode's primary tension. Naruto English Season 1 Episode 13
Loyalty, the definition of a "tool," and the weight of a life. If you'd like to dive deeper, let me know: Should I focus more on the animation quality ? The episode centers on the aftermath of Haku’s sacrifice