In the Bible, why do demons shriek most violently right before expulsion?

I believe it means that evil gets more aggressive right before it is gets driven out, because when it is about to get driven out, all this unconscious and hidden darkness must rise to the surface of conscious awareness, and when it rises to the surface, it gets temporarily stronger and more difficult to control. And right when the villain is strongest then it has ever been before, it will be defeated forever, and no villain similar to it will arise for centuries or millenniums afterwards.

In the Bible, why do demons shriek most violently right before expulsion?
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