This was all starting to seem awefully familiar. A single warrior facing against unspeakable beasts... and slaying them? Why, with the way she carried her sword and felled his Hydra, she was beginning to truly feel like the kin of Beowulf! 

His weapon could have stopped the likes of dragon curbstomps, but that would not stop its monstrous foot from touching the staff. Even if it repelled water, unless it possessed some form of intangible and invisible barrier, it would still get wet. Despite however many bells and whistles it could tote, this would not change the weapons supernatural condictivity, nor fully blunt the charge. What was reflected would only be a minimal fraction of what still coursed through the surface of the Hydra.

The weakened beam would split upon her outstretched crystal sword on its return trip, dissipating into a harmless gust of radiation at her sides. The magical echo and crystalline structure would make it naturally non-conductive on both a spiritual and mechanical level. Shin would be far less lucky on his end of things.

With the tables once again flipped in her favor, she'd follow up exactly as she would before save a single change - this time she brandished two blades at once. Her strikes would come in uneven time and would fall upon his cardinal axes where it would be hardest to parry. If he attempted to somehow course-correct, she would as well. 

Utilizing her superb memory, an indespensible tool for the learned mage, her last spell was metaphorically loaded into a cartridge; the ethereal bolt and her swords respectively. At the first sign of his weapon re-emerging, she'd be primed to strike it down once more.