"Then you know that sensation when you swallow water down the wrong pipe," said the doctor, nodding triumphantly. "That choking reflex. You see, Alex, the reason Mother Nature makes you choke on water, is because there is no proper oxygen in water for your lungs. The enema liquid, though, which will be filling your lungs, is not water, Alex. It is a dense silicone fluid. It carries much oxygen dissolved inside it, plenty of oxygen." Dr. Mirabi chuckled. "If you lie still without breathing, you can live half an hour on the oxygen in a single lungful of enema fluid! It has so much oxygen that at first you will feel hyperventilated."