Reply #49: Sprinkler heads are designed.......

[jschurchin]

to discharge at a given temperature. I have installed 165, 180 and 210 degree Celsius heads. They normally are shock resistant to prevent accidental discharge, although they will break if struck with enough force.

I can think of two thing's that would cause the water where she was.
1) The aircraft broke the riser carrying the water supply to the upper floors. I do not think this is the case though as the water would be pouring down the core and flooding from the lowest point upwards.
2) Something caused the temperature to rise in that area triggering those heads. What would cause this rise in temperature, I do not know.