Hal, those trained people took several minutes, when time needed to be measured in seconds.
Not according to this:
"Nearby staff responded "within seconds" on Sunday but quickly determined the dog attack was fatal and didn't send handlers into the enclosure to intervene, Pittsburgh Zoo and PPG Aquarium president Barbara Baker said."
Granted - that is the zoo saying that...
However - other eye witnesses say one of the zoo people did respond within seconds.
I wasn't there so I don't know for sure.