Goku puts everything into his Kamehameha to injure Merged Zamasu, injuring his arms before using his Kaio-ken technique to knock his opponent down when he grabs his foot. But Goku collapse while Merged Zamasu begin to improperly heal, Gowasu assuming that Black's mortal body is disrupting Zamasu's indestructible body. Goku decides that the only way they can win is for him and Vegeta to fuse using Shin's Potara earrings, Vegeta reluctantly agreeing after Gowasu explains that a Potara fusion that does not involve a Supreme Kai only lasts for one hour...