Thunder Bagua! Here Comes Kaido's Son!

A mysterious masked figure runs through the halls, excited to meet someone while being chased by the Beast Pirates who see them. They crosses through several rooms, including the one where Kid is fighting Beast Pirates. Meanwhile, Ulti checks on her brother Page One. She again throws a fit in front of him, remembering how she rode on Page One's back down the staircase. She then confronts Luffy, being told that he is a pirate intruder. They immediately clash and headbutt each other, each attempting to knock the other down. Ulti gets the upper hand and slams Luffy into the floor. She transforms into the Human-Beast Form form of her Dragon-Dragon Fruit, Ancient Type Model: Pachycephalosaurus while Page One transforms into his full spinosaurus form. Although Luffy gets up, he acknowledges that he is in an Emperor's castle and fights at full strength. Eventually, Luffy grabs onto Ulti's horns and slams her into the ground, then defeats Page One with a Haki-imbued Gear Third punch. Enrage, Ulti transforms into her Beast Form, headbutting Luffy. She prepares a more powerful headbutt, but the masked figure appears and uses a kanabou to strike her down with the same move Kaido used to beat Luffy in their fight. Excited to see Luffy, the masked figure carries him away, saying he has been waiting for Luffy, before revealing himself to be Yamato, Kaidou's son.