"Cannot be avoided" was indeed a poor choice of words. Anyone with sufficient MAGICAL PROWESS could avoid or deflect the curse.

So... Edmund avoiding a soul-tearing magical curse that you don't even need to hear being casted because it fucking rends your soul... without being HIGHLY adept at magic... How? Because unless the guy is secretly a badass wizard, something tells me he has no magic powers.

Go. Hurry up. I await your logicfails.