My theory is that Jackson was trying to show how the life of Sauron was tied to the ring. He is trying to show that his physical form is only becasue of him having the ring and therefore, as soon as he lost it, his physical form exploded. Even when the balrog, another maiar, dies, he is shown laying there, but with Sauron exploding, it is kind of like a genie being sucked itno a bottle, he had to withdraw into the ring when he no olonger possessed it. They did this in order to make it more dramatic.
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