Vs. severed hand

Victoria had flown out of the blurred formation and smashed into a tall spruce about halfway up the tree. She dropped back to the earth already crouched to spring.
	Simultaneously, Edward — all but invisible with speed — had twisted backward and caught the unsuspecting Riley by the arm. It had looked like Edward planted his foot against Riley’s back, and heaved —
	The little campsite was filled with Riley’s piercing shriek of agony.
	At the same time, Seth leaped to his feet, cutting off most of my view.
	But I could still see Victoria. And, though she looked oddly deformed — as if she were unable to straighten up completely — I could see the smile I’d been dreaming of flash across her wild face.
	She coiled and sprang.
	Something small and white whistled through the air and collided with her mid-flight. The impact sounded like an explosion, and it threw her against another tree — this one snapped in half. She landed on her feet again, crouched and ready, but Edward was already in place. Relief swelled in my heart when I saw that he stood straight and perfect.
	Victoria kicked something aside with a flick of her bare foot — the missile that had crippled her attack.
	It rolled toward me, and I realized what it was.
	My stomach lurched.
	The fingers were still twitching; grasping at blades of grass, Riley’s arm began to drag itself mindlessly across the ground.