Well, the opening of the chapter tells us that "Bright Earendil now ruled the remnant of the Eldar and the Edain." I would think that to be a functional ruler he would have needed to be conversant in the relevant tongues: Sindarin, Quenya, Hadorian and Beorian. I think we have established that some of Beor's folk escaped Dorthonian and reached safety. Nor need we boggle at a half-Noldo learning languages easily!
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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