During the Nibelheim event, Sephiroth, insane after discovering his origins, sets fire to the village. After killing many villagers, Sephiroth proceeds to the Nibelheim reactor, where Jenova had been encased. Soon after he arrives, Tifa, a resident of Nibelheim angry at Sephiroth for killing her father, attempts to kill him. He quickly knocks her away and continues to Jenova's body, preserved in a large glass tank filled with liquid. Zack follows Sephiroth into the reactor and fights him, but Zack is eventually disarmed and injured too severely to attack further. Sephiroth returns to Jenova's body, but does not hear Cloud approaching.