OK, I'm asking for Help.
Where does it say in the Spellcasting rules about sucking up energy around you for aiding evocation spells?
My best example is... dammit what was her name, Harry's ex girlfr.. Elaine? Yeah, in White Night, when the WCV has the psychic whammie on her; Harry gives her a wake-up call and she sucks up the electricity in the room to blast the vamp right out through the wall.
Clearly not thamaturgy on account of the short time and no ritual prep.
There is probably half a dozen more examples I could quote, but this is the best I could think of.
Any ideas for the near-sighted slightly clueless blackheart?