 Vaughn discounts Brody and Hooper's statements that a huge great white shark is responsible for the deaths, and refuses to close the beaches, allowing only added safety precautions.On the Fourth of July weekend, tourists pack the beaches.Following a juvenile prank in which the presence of a shark is simulated, the real shark enters a nearby estuary, killing a boater and causing Brody's oldest son, Michael, to go into shock.