Luke tells Rey that he had briefly considered killing the sleeping Ben after seeing a vision of the destruction he could cause , but relented ; Ben woke to see Luke with his lightsaber drawn and turned to the dark side .
Luke felt betrayed .
Luke tells Rey that he had briefly considered killing the sleeping Ben after seeing a vision of the destruction he could cause , but relented ; Ben woke to see Luke with his lightsaber drawn and turned to the dark side because he felt betrayed .