The pure Ascendant energy that Rowan had blasted out of his body served the function of relieving the strain of holding back his Ascendant energy from fleeing his body, but it had also injected a ridiculous amount of Ascendant Aura into the atmosphere.
Inside this zone of halted time, it was impossible for any Aura to flow into it, and although Rowan had made the Shiik harvest only Calamity Aura that he had purified, this restriction did not fall on the minor Calamity gods that she had created.
The Ascendant Aura he unleashed was not only extremely plentiful and potent, because it was extremely pure, the Calamity gods who survived its explosive release and were pushed back, were suddenly inundated with a flood of Aura more potent than anything they could receive on the surface.