Someone give this mom a gun and a medal for courage and bravery! 

However, a phone will call for help that may, or may not arrive in time. It will not stop him from starting a physical confrontation in public. 

A gun in the hands of this mom yields better results. You stop the criminal from abducting a child. While motivating them to sit down, shut up, or die until the police arrive. 

This ensures that the child is not abducted. The mother doesn't get hurt and loses 2 children. As well as making sure the criminal immediately stops their evil by law, or death by her righteous hands.