Kakashi discovers that Naruto's wound has already begun to heal rapidly, hinting at the unnatural power of the Nine-Tailed Demon Fox sealed inside him.

A Dangerous Mission! Journey to the Land of Waves! - Narutopedia

Elsewhere, Gatō lashes out at the Demon Brothers for failing to kill Tazuna, prompting Zabuza Momochi (the "Demon of the Hidden Mist") to intervene. Zabuza threatens Gatō and decides to finish the job himself. Key Moments & Highlights