Haakon that's certainly one way to interpret the Spell, or one way it could affect victims, but I don't think it's the only way.
Whether or not that's Edhellos' situation, how does she know to betray Dorthonion just before Dagor Bragollach? She'll only know the attack is about to start if Morgoth tells her via telepathy. (Which also means we should introduce the concept of telepathy early this season, such as with Finrod learning Sindarin too fast.)
I think a musical theme is a good way to represent this because it's noticeable to the audience, invisible to the charaters, and a representation of Morgoth's direct power as music. We could even show the victim reacting to the musical theme... they can hear Morgoth.
For some victims the missing factor can be telepathy. I think that somebody who has been broken and terrified might be let out even if they have a little will left to resist. Morgoth telepathically sends orders, with a reminder of the terror of his eyes. They can refuse, they can even [try to make themselves] block him. But he will know if they block him. He will know, and he will find a way to capture them again, and there will be punishment of body and spirit. They aren't rational about the chances of capture, they're convinced he can get them no matter how they hide. Maybe they're convinced that Morgoth will win no matter how the Eldar resist, and it's only a matter of time before their stronghold falls... which is actually quite true.But then - how does she know exactly what to do? How did Morgoth instruct her to open the gates (or whatever it is she’ll do)? How many instructions has he given? Or does he give her instructions continuously, somehow?
No, something is missing from this line of reasoning. I think it’s the power of domination that you’ve been talking about. Edhellos has to feel that she’s owned by Morgoth, that she belongs to him. She’s broken.
Whether or not that's Edhellos' situation, how does she know to betray Dorthonion just before Dagor Bragollach? She'll only know the attack is about to start if Morgoth tells her via telepathy. (Which also means we should introduce the concept of telepathy early this season, such as with Finrod learning Sindarin too fast.)
I think a musical theme is a good way to represent this because it's noticeable to the audience, invisible to the charaters, and a representation of Morgoth's direct power as music. We could even show the victim reacting to the musical theme... they can hear Morgoth.