“Kylo, his entreaty rejected, had flung up his own hand, harnessing the Force to arrest the lightsaber’s flight. The weapon hung in the air between them, quivering faintly. Rey stared at it, willing it into her grasp. But Kylo was pulling it toward him with equal determination. Between them, the lightsaber shivered and danced. They stared at each other, eyes locked. Rey could feel the Force heaving like the sea on Ahch-To, whipped into a fury by their attempts to manipulate it. And she could feel the kyber crystal at the heart of the weapon seeking a resonance, trying to find harmony where there was only dissonance. Caught in their tug-of-war, the crystal seemed to keen in the Force, a wail that Rey could feel in her bones. She and Kylo were sweating now, neither willing to give so much as a millimeter in their standoff. Until, finally, the crystal sheared apart, its unleashed energy tearing the lightsaber’s housing in half and filling the throne white.”
Reylo Source 