Kylo had retreated at finding Rey in his head—had practically fled from her. But that
had not been the end of that strange, sudden connection. She had seen more—far more.
Somehow, almost instinctually, she knew how he accessed some of the powers at his
command—even though she didn’t understand them. It was as if his training had become
hers, unlocking and flinging open door after door in her mind —The Last Jedi Novelization [Jason Fry]
Reylo Source 