The heat index that day was already hovering near 105 degrees. By the time Kirwin and his team met the boat at the marina, the victim was conscious but was suffering such severe leg cramps that he couldn't stand. The paramedics took him by stretcher to the air-conditioned ambulance, and Kirwin began checking his vital signs on the way to the closest emergency room. The man's breathing was fast and shallow. He was pale, sweating profusely, and his body temperature was 99.2. With the patient lying flat on his back, his feet slightly elevated, Kirwin did an EKG, then placed bags of ice under the victim's arms and groin and started two IV lines to pump in fluids and electrolytes.