User blog comment:Bo-Katan/Thawne and Time Remnants/@comment-27700324-20171203161527/@comment-20053828-20171203210648

Yeah, or the Thawne that didn't join the Legion after future Thawne from the rewritten reality joined them in order to stop the future Legends escaped and somehow "crash landed" on Earth-X in attempt to get away from the Black Flash. But Black Flash cannot die. I have no idea why people think that, it was never confirmed by anyone that he died. In fact, he came back after Thawne after exploding in front of Barry.