People don't speak of science per se, but rather natural philosophy. The philosopher believes that the world is explainable, even deterministic, at some fundamental level. The fact that they are essentially trying to develop a mechanistic view of a natural world that includes magic makes them a little confused.
They want nothing to do with their mystical colleagues, and seek rational ways to explain magic. This new rationalistic understanding is therefore the means of "casting spells." The inherent unpredictability of magic bothers them somewhat; they're convinced that the world shouldn't be like that. They've heard of Heimspiel's Uncertainty Principle, and want no truck with it.
The fact that crystals and auras and such actually WORK is a source of great perturbation for them.