My first rescue was off the coast of California in the summer...Guy had been in the water with only a life jacket for about 6 hours.
He was completely incoherent from the cold water...he kept babbling about some, "Is There a God" thread. I asked my crewman to move him to PARF
Hypothermia is a slow, inexorable slide unless arrested. The guy really was in distress and had, when we snatched him, no apparent will.