The mother saw the attack through a window and ran over to protect her son. It was the most heart wrenching part of the press conference.
https://youtu.be/WoGxPzzxxpc?t=1890
Edit: The mother ran out and laid on top of her son while the dogs were right next to them. She was yelling for everyone to stay away because the dogs were dangerous.
Heroic doesn't even begin to describe her actions.