Because Bai Xiaochun was mostly out of sight inside the paper ball, and also because Zhou Yixing had to focus on moving ahead, he didn't see what had just happened. He was excited, only occasionally looking back to see how much the paper ball had shrunk.
By this point, the ball had already shrunk from its previous size of 30 meters down to about half of that.
In addition, Bai Xiaochun was slowing down, as if he were about to succumb to exhaustion. Zhou Yixing could even hear him let out a howl of seeming despair.
"Your comeuppance is at hand, Bai Xiaochun!" Feeling almost completely free from care or worry, Zhou Yixing laughed loudly and pondered how all of this had been carefully planned out and executed by none other than himself.