Let me give this a try.
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The jutsu starts off with both Zabuza and Haku side by side, with the former finishing off a series of hand seals while the latter creates an ice mirror. Zabuza then uses a Water Dragon that traps the target in its jaws, guiding the dragon upwards as he does so. Haku, entering his mirror, dashes to catch up to the rising jutsu and reappears right beside the dragon's head, a hand extended towards it while the other finishes off a series of single handed seals, quickly freezing the entire thing with only the target's upper body visible as all below is enveloped in the frozen water dragon, now shaped more so like a pillar. Haku then disappears in a Shunshin, revealing Zabuza falling behind him, bringing Kubikiribocho down onto the target with a mighty swing that causes the entirety of the pillar to break apart in one go.