Ill try to take a look at it over the next day or two and see if I can complete it with your character unless someone else tries in the meantime. Cnances are though if you can't complete the ending maybe I can't either & it may be because your character build isn't strong enough. Also as in my first post, I couldn't save at the end of the air battle but ll try again. Will let you know.
My feeling is that you may have a great deal more personal insight into this chapter than I have.
I feel confident that someone (with more advanced scrutiny) will see what I will describe as an "error marker"
If I view a You Tube video of the sequence I find it fascinating.
The Dragon appears to float from Nest to Ballista Tower simply rejeuvenating and recovering health instantly.
It is truly astonishing as my Dragon is the complete diametrical antithesis..Potions are ineffective no matter what the potency.
Spells are useless because between the time the spell is cast (recharge time) the few seconds of "recharge" is all that is needed to kill Dragon
So in essence the Dragon's Protections (spells and potions) are useless because they are not strong enough to withstand the few seconds worth of attack that is rendered during what I call "rest or rejeuvination"