Buu returns to Piccolo, smiles, raises his arm, and starts firing off energy blasts straight up. The fireworks are spectacular, and the blasts arc down to the Earth, and each one kills exactly one person. Dende collapses at the sight of so much death. Buu smiles, and says that everyone on Earth is now dead. It wants It's opponent to come out to fight.
Piccolo gives in.
However, since the fighter is now sleeping, it'll take 2, no 1, hour. Buu asks how long one hour is. Piccolo creates a sandglass, and says that this will empty in one hour. So, Piccolo answers back that Mr. Satan's daughter is also up here with them. Buu recognizes Satan's scent, and concedes.