Kakashi was surprised to see Aika using her wrist to block Zabuza's Kubikiribōchō sword. Their was blood running down her arm, it was cut through deep. No wonder Sakura screamed, Aika's lucky her hand wasn't cut off.
"you got more guts then i thought girl" Zabuza said
Meanwhile Sasuke is holding his own against Haku, activating his Sharingan, which allows him to track Haku's incredibly fast movements. After hearing Sakura scream Sasuke and Naruto were worried about what was happening out there.
Naruto stubbornly refuses to accept that Haku is too fast for him, but he is running low on chakra and faints. Haku, realising that Sasuke would have the advantage in a drawn out fight, targets the vulnerable Naruto with a volley of senbon, and Sasuke instinctively moves to shield his teammate. Naruto wakes up and sees Sasuke standing in front of him, struck by many senbon.
Naruto is shocked and catches Sasuke as he collapses. Sasuke died in his arms, Naruto is enraged and unconsciously taps into the chakra of the Nine-Tailed Fox within him. Both Kakashi and Zabuza sense and makes Kakashi wonder if the seal is broken.
Kakashi looks over to see Aika growing weak, Naruto must be drawing power from Aika's half. Zabuza removes his blade from Aika's wrist, Kakashi was confused, why wouldn't Zabuza use that moment to kill AIka. Haku watches in disbelief as the fox's power heals Naruto's wounds