A thought has occurred to me - do we need the audience to know that Melian is not dangerous right away?
It is very, very common to have a fairy tale incident of a protagonist stumbling upon a beautiful woman who is a complete stranger to him. Sometimes, she is good, and it turns into a love story. Sometimes, she is evil, and will put him under some sort of enchantment. Sometimes, it's an illusion, and she's not really a beautiful woman at all. Sometimes, she's a mythic creature and he essentially kidnaps her and brings her home as a wife. Sometimes, she kidnaps him and takes him off to Faerie.
The idea being that EVEN IF she is good, there is a legitimate fear of the unknown there. When reading a story, you don't know which story it is until you get further into it. Think about George MacDonald's
Phantastes or
Lilith - the man wandering around in Faerie meets people all the time, and figuring out friend/foe is not straightforward. Sometimes the dancing skeletons are friendly. Sometimes the injured beautiful young woman is dangerous. And sometimes.... Well, anyway, you get the idea. When reading those stories, I was not always immediately clear on which characters we met were to be considered...trustworthy. You had to keep reading and wait and see what they would do, and sometimes the protagonist would trust more easily/quickly than the reader.
We need to consider how we will do this scene, since we will be mimicking it later. We'll have Beren meeting Lúthien in this way, but we'll also show Túrin meeting Nienor in a similar situation - stumbling upon her laying naked on Finduilas' grave. Strange beautiful women aren't always....safe.
To continue with the reference to bad George Lucas films....in
Ewoks: Battle for Endor, the young girl Cindel is lured away by a woman singing her mother's lullaby. The scene shows up about 15 minutes into this clip (you see the witch at 18:25). Suffer through 4 minutes of this film
So, that's the 'dangerous siren' version of beautiful woman in the woods, and she reveals her true, evil nature and kidnaps the child.
Is there any reason we would want to prevent the audience from going 'Wait, Elwë, don't touch her!' when they see this scene? Knowing that they're beginning a love story and he's fine, just fine, really....diminishes any tension or 'what happens next???' for the audience. The characters on screen are all going to be worried about Elwë's disappearance - should the audience know that he is not actually in any peril?
I am leaning towards making people think she has put a spell on him, and then at the end of the episode, we realize they are BOTH frozen together...and only after they snap out of it in a later episode does the audience learn that they are both in love with each other. It's okay to have some open questions, as you want to encourage the audience to watch the next episode to find out what happens......
I am not a fan of the 'false danger' set ups....where Treebeard takes the hobbits to the 'white wizard' and the audience is meant to think it's Saruman, but, surprise, it's just Gandalf, no trouble. I am not suggesting we make Melian appear to be a dangerous enchantress...I just mean that we can make her an unknown quantity, so the audience maybe takes some time to determine that she's 'safe'.