Ball Guy followed Alex and Kasumi to the greenhouse unnoticed. As he stepped inside after them, he saw the hidden battle system. 

[i]Huh. Strange that there's a battle system hidden out here. Oh well, lets see how Alex fairs off.[/i]

Ball Guy waited in the corner of the greenhouse behind a row of ferns. He rested his hand on one of the hardcases that contained one of his backup Gunpla, the Radiant Rider.