Because of your comment
"Wait...wait...someone “claimed” the dogs are/were pit bulls, so......no facts required."
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Why in the world was the woman allowed in the enclosure?
Perhaps they figured that if they had rabies she'd already been exposed, or more likely they knew enough about dog breeds to realize that pits don't need rabies to go into a frenzy.
But they do need a reason. Dogs don't do that without some kind of reason. For instance I've observed dogs can get into a pack mentality when 3 or more are in certain environments. This was not their home environment. They were out of their element. I suspect rabies or something else but we will likely never hear whether they do or don't. We are left to assume the worst of these dogs simply because they are a target breed by some fanatics.