I don't think Flemeth's prophecy had anything to do HLTA.

^ Maybe it's Herald Likes Terrible Acronyms.

If this is about who died in the Fade, it's explicit when you choose that the person who stays, "may die". Everyone in the game afterwards acts as if they are dead, but the wording is very specific to leave the character open for use in later games if needed.

I've never thought that HTLA had anything to do with the prophesy. I think it had to do with choosing sides in Kirkwall, which echoes forward into the next game, or something else entirely.

It doesn't have to do anything with the Abyss quest necessarily if that was what you were referring to. she could tell that line to any hero and it could probably work considering the general message. it is like a fortune teller's trick and some writers take advantage of it. there is even the possibility that she was just messing with us at that moment by talking about flying since hawks fly.

According to the entry on Corypheus "nothing that knows doubt can survive the Fade", which suggests that if you have sufficient confidence in yourself (and possibly faith in the Maker or whoever you believe in) then it is possible to survive the place. Presumably time has no real meaning in the Fade so theoretically you could survive in there indefinitely since if you mind is strong enough you could sustain yourself by imagining food and drink, so provided the big spider demon didn't get you or the other denizens of the Fade, then you have a good chance.

This of course flies in the face of everything the Chantry teaches about the "sin" of the Magisters in even setting foot bodily in the Fade but most of their teaching has been rubbished without any of them actually admitting as much. Nevertheless, everyone seems to think Hawke/Stroud/Loghain/Alistair is dead but as we know that isn't a permanent state in Thedas.

I think it refres to the name of the quest which is Here lies the Abyss if I'm not mistaken whic is the questline you do with Hawke and the warden in DAI.

fortune telling 101: make something general and vague and people can interpete it as they see fit, which would give it a high likelyhood the "prophacy" will fulfill.

I don't think it was anything specific. She was just talking about how Thedas is afraid of the inevitable fall into the abyss, which will bring about chaos and uncertainty. The "abyss" here is a metaphor. You could argue this was probably about the mage templar war, the breach, or about what Solas is planning, but from Flemeth's perspective "the fall" is also necessary for change to happen, because that's also when heroes rise to greatness. She's telling Hawke to watch for that "moment" and to leap for it.

As it applies to Hawke, it could be about his/her role in the mage/templar conflict. In DA2 Hawke experiences a rise to power and a fall of sorts. If the devs had any further plans for Hawke that plot thread was probably either abandoned or given to other characters like the Inquisitor by the time DAI and that quest line was written.

Remember she is also Mythal, who was supposedly murdered and saw the fall of the ancient elven empire, which she described as "inevitable" and something that could not be changed. She was once one of the most important Elven gods, who saw her own fall from power and the fall of her people.