I don’t want to start a whole thing, but this was actually my least favorite thing about Rings of Power.
It’s the wrong damn Durins to be teasing a Balrog! The prince is Durin IV, and the Balrog no diffs Durin VI after he delves too greedily and too deep.
Maybe they’re planning to have the dwarves fight and defeat him, and like seal him away for a couple hundred years or whatever but… Can you not? The Balrog is supposed to be ignoring this whole period, slapping that snooze button and blocking Sauron’s calls.