As the second day of the WDC begins, Bronk and Caswell are invited by Quattro to participate in a Battle Royale for all their Heart Pieces. They go to an abandoned site with Yuma and Tori, and Quattro brought his younger brother, Trey, with him. Although he acts innocently enough, he soon reveals his true purpose is to gather Numbers and summons his ace monster, Number 15: Gimmick Puppet Giant Grinder, using its ability to use their Xyz Monsters against them and defeat them. Also, even after Bronk and Caswell lost all of their life points, he continued attacking them, causing Caswell to be knocked unconscious. Yuma challenges Quattro, Shark arrives on the scene, challenging Quattro.