It's the Second Stage of the Steel Ball Run race. A lot of competitors already got eliminated and killed, some gave up and left the race.. You and Gyro managed to get into the favorites to win.

As Gyro rid his horse, he heard some hooves clicking with a "clopt" sound. He gritted his teeth in irritation and sprinted, not letting you surpass him. He was going to use one of his Steel Balls, if needed.