Such a poorly written article, “loose” for “lose” and unclear wording on which owner had the knife. If you watch the video, it’s made clear it was the owner of the dog being attacked (ie “under”) that pulled the knife and killed the pit.
When a pit attacked my dog, I gouged its eyes; the rescue operation that was (mis)handling it finished off the job.
Ugh—that must have been so traumatic!
And I hope you and your doggy were okay.