Possibly. It had taken Aibghalien months of specific study to master the art of manipulating the energy within these crystals. On the other hand, clearly Signum had a certain aptitude for drawing energy out of people that he didn't.

With a gesture, he sent the mostly-empty crystal drifting towards her. No sense in wasting a full one -- situations like this always had the possibility of ending up in explosions. "If you can't access it directly I have an idea," he said, rather grimly, "though I would prefer not to use it if possible."