As it turns out, the Zanpakutou have returned to normal thanks to Kurotsuchi's research. They start to take down the Menos in the area with their respective Shinigami, but more Menos then pour into the area through the Garganta. Byakuya and Senbonzakura try to close the tear and push back the Menos by blasting it with their petals, but their power alone isn't enough. Once all the other Shinigami and their Zanpakutou join in though, the Garganta closes, and that crisis is averted. This still leaves, however, the giant dome that used to be Muramasa which has Ichigo inside.