All Sauron wanted with the Numenoreans was for the Valar to destroy them. If he truly wanted to free Morgoth, wouldn't he bide his time, corrupting more and more men until he believed he had the power to confront the Valar? For surely the full power of Numenor was never going to be matched in any Third Age scenario. Sauron would never have sent the Men to their doom if he wanted Morgoth freed.
I quite like the idea of Sauron defying the lightning of the Valar. It seems an uncharacteristically brave, lead-by-example thing to do for a Dark Lord. Maybe Sauron conjured up that particular bolt himself, to break the spirit of the Men into obedience once and for all? It was a fiery bolt and unique.
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