The last time the invaders didn't do this was simply because there was no hope for humanity to escape.
This time, due to the progress of Earth's civilization in technology and ample preparations for evacuation, the enemy changed the operation mode of the Solar System Barrier.
This "minor" change, which seemed like commonplace for the invaders, instantly extinguished the fire of human civilization's continuity and brought a catastrophic disaster to humanity.
The invader seemed like a pervert playing with ants.
Slap it once, find out it's not dead, the ant can still struggle, then slap it again, effortlessly.
The invaders didn't do it in the past simply because it was unnecessary.
Now it is necessary, so the invaders do it.
The core quantitative parameter of the plan suddenly becomes a variable, turning Harrison Clark's seemingly perfect strategy into an illusory bubble.
Now, humanity's newly ignited hope is instantly extinguished!
