This kind of situation was impossible in real life because when the number returned to zero, it would release a huge amount of energy, causing the ground to suffer a strong impact and swallowing people deep underground. In novels, this situation could be a fictional plot to show a mysterious power or dangerous event. For example, the number on this person's ball represented some kind of mysterious energy. When the number returned to zero, this energy would be released and cause people to be swallowed deep underground. This kind of plot could make the reader feel nervous and afraid, increasing the readers 'reading ability.