AMF isn't an anti-magic field per se. Rather what it does is makes it harder for mana to "link" properly. It can't have an effect on already "linked" mana, which is why spells still work.
Think of it like interference. It makes it difficult to get mana to link in the first place within it, but mana linked outside of it, or mana that is already linked, isn't effected by the AMF.
That is the key difference between AMF and the Zero Effect that Eclipse has. The Zero Effect doesn't make it difficult for mana to link, it instead force-ably breaks the links. This is generally why magical spells and defenses do little against the Zero Effect as it breaks down the spells at the basic level.
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