Mercury Lamp's arrival was a pre-warning signal, Shana's intrusion was a confirmation of the alarm, the Academy Apocalypse Strong Team and the misdirected Sagara Sousuke represented the onset of a heavy downpour, while the subsequent Spartans marked the official first peak of the flood.
Anyone with common sense knew that the first peak meant only one thing: a second one was coming.
The organized crossover of the Spartans seemed like a starting signal. Following closely, the swarming army of transmigrators began their actions of stirring winds and rains. Of course, the ones who swiftly reacted were the Imperial Soldiers already on standby around the world.