In normal circumstances, contracting a main space to such an extent shouldn't be attempted. That was undoubtedly like trying to bury a bomb in one's own world! Once it exploded, everyone would die together!
The world where Mo Wen was in his past lifetime was not an independent world. Rather, it was in existence with many other worlds. Hence, he knew many things about world invasion.
For example, there were many people in the outside worlds with unsatisfied desires. These people would invade the worlds of others, occupying these other worlds by force and seizing their resources.
If the worlds had enmity between one another, there would be a possibility of the conflict escalating even further, even to the extent of destroying both of the worlds! When their own main world had diminished to such an extent, it was equivalent to exposing their Achilles heel in front of their enemies. Hence, it was a very dangerous thing!
