Although Karin's approach seems meaningless... dividing oneself into so many parts, a Demigod could eliminate each hurricane he transformed into.
This Air God Creature is obviously just trying to buy time... a powerful Deity who can send Mannan away with one move could surely send him away too.
But this approach unexpectedly put Amanata in a crisis; the Sun God's attacks weren't enough.
The power he initially used still came from Amanata's Holy Grail... The reason he could so easily form this incarnation was that he had already left a sliver of his Divine Soul in his cup.
He didn't use it before because AO hadn't relented, and even if Amanata had the chance, he didn't dare use it.
Just like the Three Gods of Death, with Bane alive, Baal could still struggle, but the strongest Milko was only left with a trace of residue!