So, a thought occured to me. In the books one of the ways that is offered to harry, to ditch Lash early on, was putting aside his magic.
Now, in game.
Could a wizard, who has pushed himself too far, has gone all out and smashed past the point of no return give up his magic to save himself from NPC?
So let's give him Evo, Thaum, and 3 levels of refine for -9 from a base 10 refresh.
Now he's gone all out killed half a dozen people blasted straight to -11 refresh adjustment putting him over that crucial point.
Could he give up his magic (Evo, Thaum, Refine) to put himself back under the threshold and become a Pure Mortal?