Wolfgang fidgets. They are very shy about talking about what they can do, partially for reasons of living in a world where people are still inclined to be like burn the witch, but mostly because either it frightens people, the extent of what they're capable of... or it just sounds like bragging.
“You just... do it backwards...” The question of making a thing into another, slightly different thing, is a little perplexing. Could they do it? Probably (turning dollar bills into hundred dollar bills was the first thing to occur to them), but — “It has to have the same amount of matter. Um... more or less...”