Thanks. So basically what happened is.. the chief God
Equisetum was basically indestructible. Anos even with all his power couldn't finish him off without destroying the world. Anos wants to protect the world and Equis is his world (romantic, huh?).
So Misha created a three layered world where both of them can release their magic power without destroying the world. Anos didn't need to hold back there. Equis wanted to destroy that three layered world, so anos couldn't use his powers without destroying the real world.
The fate he determined was that if Anos made a single movement (like opening his eyes or us magic), the three layered world will be destroyed. So Anos is basically trapped at that point. Equis used Boros Hetero Avis, forcing Anos to make a movement. Anos of course crushed that, so three layered world should have been destroyed because even if Anos had a power that went back in time before the creation of the world, the predetermined fate should still take place before that.
But it didn't. Magic Eyes of Chaotic Destrction/Mayhem (

) destroyed that logic. So the event that should have already happened didn't. You may have noticed that Anos used his magic eyes after making a movement.
It implies that even if a hax was used on Anos as long as he uses MEOCD later, he can still counter it by destroying logic.