I feel it’s exactly what would have happened to Sheriff Brody after the experience he had in Jaws. I love the scene where he yells for everyone to get out of the water, and various other “false alarm” moments because of the trauma he’s experiencing. My favorite part is when he tells the board meeting he knows what a shark looks like and he doesn’t intend “to go through that hell again!”
That does make sense, namely in that Brody’s actions follow logically from his experiences in the first movie.