"There are many reasons."
"For example, the timing."
"The demons' army attacking the Black Prison is a rare opportunity for inside cooperation. As long as the prisoners' minds haven't entirely dried up in the barren environment of the Black Prison, they will definitely think of ways to respond to the outside force, seizing any chance for life."
"Or the location."
"The school initiates preemptive timeline operations, firmly fixing the causal line on the time fragments of the Black Prison world, enhancing the power of the Hell Equation, and creating an ideal environment for those prisoners to launch this magic array."
"Well, simply put, it's like a lantern originally made of paper now covered with a thick iron shell; when the explosion charm inside ignites, the explosion's power increases significantly...the same logic."
