Zabuza attacks Kakashi before he could reveal his Sharingan. Kakashi blocked his attack, but Zabuza was indifferent to this as he had learned a lot from their previous encounter. Haku had watched their battle back then and realized that the Sharingan’s supposed ability to read minds was nothing more than an illusion. To avoid falling for the same trick, Zabuza covers his surroundings with thick fog to reduce visibility to a minimum, and fights with his eyes closed, making it impossible for the Sharingan to hypnotize him again. As Kakashi has lost his advantage, Zabuza takes this opportunity to try to kill Tazuna. Kakashi appears in front of him at the last moment to block the attack.