Those who were not affected by this slowing perception of time in this world is probably only those four beings.
There is Azief that is slashing down his sword.
There is the Demon King that is watching in shock as the sword coming down towards him.
There is Jean shrouding himself with Time Shield. Even though he is far away from the battle, Jean knows distance is just an illusion for people of their powers.
They could easily bend space and time to render distance meaningless.
To a powerful being like the Demon King and Death Monarch, their battle would overwhelm the world
He could not help much. Even Hikigaya only had been able to strike only one attack before he had to retreat
Hikigaya had already disappeared turning into gaseous substance after pushing an illusion into the Demon King head.
There were many things that happened before Azief swung down his sword down.
