A similar situation occurred in the WW2 bombings of both Hamburg, when people climbed into limited amounts of water ahead of the advancing wall of fire. Fountains in Hamburg and water barrels in Tokyo provided only fleeting protection. Once the water heated up it made the situation far worse.

The result was pretty much the same in both cases ... soup. Not a pleasant way to go.

People can survive exposure to higher temperatures longer if the air is dry. Steam and hot water are far more efficient at transmitting heat to skin than hot dry air.