One does not just reveal their secrets, Sato. There is a reason why that is an often-spoken law in which magicians abide by.

"That'd be for the best. Would probably have to kill you if you really did want to know." Rey then pauses, feigning a passing expression of alarm when she tilts her head at him, before the look is gone. "Oh, oops. Too late."

Ha ha. Immortality jokes.