I agree, it would not come up as about Milah, but to say that was how he knew Baelfire, and the story of him being on the ship.
I don’t know if he will get to how Bae left the ship, but we will see.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass