HoME XIII: The Weird Bits

[Pitchwife]

This is how the story goes in the first draft, which (as usual) underwent several revisions and transformations. According to Tolkien's latest notes

Originally Posted by HoME XIII, Of Uinen and Miriel, Footnote 23

The leviathan is not to be thought of as a dumb beast but had speech and understanding alike to Manwë's eagles. It would have followed Uinen's command to the tehta had its orders not been countermanded by the higher authority of Ossë, who had learned about his wife's infidelity. Beside himself with jealous wrath, he incited the leviathan to destroy his rival together with all of her native isle.

Ossë, both a homophobe and a genocide - seems his brief flirt with Melkor in the beginning of Arda had left a deeper influence than we thought up to now.