RogerTriantafilo, the father of kid, answered why did the mom run away leaving her son behind. He said the following:
"After checking his wounds she made sure the dog did not return for a second attempt. The owners were there also and she was bit by the dog as she tried to pin him in his yard. The owners did get control of the dog and secured him in which she immediately returned to attending to our son. I did not include that video because it was not so much about the dog but about the cats actions. "