Issac and Bahamut had been besieging the Leviathan World, but after the interference of Sundered Night and the fact that Ivar and Apex were hunting Lilet, that was no longer needed.
As for Hyperion, now that the problem with the Sacred Trial was over, and he had ensured the safety of his people and world, he could leave the Titan World without concerns.
All of that allowed the Magus Primarch, Titan Primarch, and Dragon Primarch to be free to do whatever they wanted. And what better use of their time than to prevent the Body Core of Existence from hindering the path of Zatiel, Ezequiel, and Ragnar?
"¡AHHH!"
"¡AHHH!"
"¡AHHH!"
Issac, Bahamut, and Hyperion unleashed the full power of their Omega Laws and sealed space-time between Abyss and Baator, making it so that the enhanced Archdemons would have to pass over them to reach.