While the scene is incredibly sad, as J.A. Bayona told Empire, there is a beauty to it, too.
Aesthetically it is a pretty shot, but more than that there is a poetry to the melancholy, as the journey of these films comes full circle, with John Hammond’s dream, the island, and the previously established natural order all perishing along with that brachiosaurus as the universe of the films turns the page to a new chapter.
All of the dinosaur deaths in the film were sad, especially when we saw some of the dinos choose death by water over death by fire as they dove into the ocean, but the brachiosaurus hits extra hard because we have familiarity with it and a nostalgic factor, things that are only amplified by the knowledge that it is the very same brachiosaurus from Jurassic Park.