winter knight vs storm

I gathered my rage together and reached down into the ground beneath me, found the fury of the storm within it that matched my own. I thrust the end of my staff down into the misty cloud-ground as if I'd been driving a hole through a frozen lake, then extended my right hand toward the Winter Knight. "Ventas!" I shouted. "Ventas fulmino!"
The fury of the storm beneath us reared up through the wood of my staff, electricity rising in a buzzing roar of light and energy coming up from the ground and spiraling around the staff and across my body. It whirled down my extended right arm, a serpent of blue-white lightning, hesitated for a second, and then lashed across the space between me and the tip of Lloyd Slate's sword, fastening onto the blade, and bathing Slate in a writhing coruscation of azure sparks.
Slate's body jerked, his back arching violently. Thunder tore the air apart as the bolt of lightning struck home, throwing Slate into the air and hurling him violently to the ground. The shock wave of the thunder knocked me down, together with everyone else in the immediate area.

Slate tried to roll away, but Fix rained two-handed blows of the monkey wrench down on his back. Evidently, whatever power it was that let Slate shrug off a bolt of lightning had been expended, or else it couldn't stand up to the cold steel of Fix's weapon. The little changeling pounded on Slate's back, screaming at him, until one of the blows landed on the back of his neck. The Winter Knight went limp and lay utterly still.