A 30-year-old male is found submerged face-down in a cold river by passers-by. Submersion time is estimated at 8 minutes. He is pulled out, is unresponsive, and has no pulse. Bystanders have commenced CPR. The updated JRCALC 2024 drowning guidelines apply. What is the key principle that differentiates drowning resuscitation from standard cardiac arrest management?