From the video, it appears the light fixture is 3/4 full of water. A working GFCI should have prevented the pool from being energized. Either it failed 'ON', or it was not there. Remember, everything fails eventually.
Newer GFCI's are not supposed to fail ON but I have seen older one's do so.
There is enough voltage gradient (call it resistance) from the hot side of the conductor to the ground that a a breaker did not trip. Remember grounding is not bonding.
It will be interesting to find out what the cause was. We can all learn from it.
What a horrible experience for a family.
There needs to be a better way of telling when water is energized, that is, without using a meter. Vince April 6 2016, 12:51 pm EDT
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