Having fun.
With no one to play with and no Blue Eyes White Dragon in sight to apologize to, "Blue" has found himself a big rubber ball and has decided to play with it, batting it with his fists and chasing after it as it zips down the hallway on the 18th floor. The ball is not moving too fast, but it's not bouncing either. It's just rolling and he's chasing it, laughing with glee.