I'm not sure why a question was closed and couldn't find a better place to discuss it:
It was closed as an exact duplicate of two questions. Both of which talk about the same bug each, where a dead dragon body either appears suddenly in an area or falls from the sky. My question was about why a dragon that dropped dead in the middle of a fight, while attacking, flying and roaring, it wasn't an animation bug and it didn't just die suddenly and fall lifeless from the sky. I explained this in the comments and in a small update but perhaps this was just missed by reviewers.
If not I'm genuinely not sure why it should be closed, there's not a satisfactory answer in either of the supposed duplicates.