He didn't need to eliminate them, all he had to do was get the 'mana whirlpool' going, and the spells SHOULD follow it in, to get back to where they 'should' be. That was the theory at least, though since he was utterly defenseless and not dodging at all, he hoped Aurelia was going to be ready with healing spells, as the first spell started turning 'toward' him even as he started moving the greater amounts of mana faster. If nothing else, he was going to write a book later about all the stupid things he survived doing simply because he had no other choice and no training telling him to not do it.