Husband should have stabbed the fuckers repeatedly in the guts as soon as they made a beeline for the woman. Stab, twist, and withdraw. Repeat until both threats have been eliminated.
As long as the public continues to be complacent, this shit is going to increase ever more. This is going to become the new version of the "Knock Out Game" in no time. When "Whirrl Star" videos start showing these perps getting deaded with extreme force as soon as they start their acts, this shit will stop very quickly. Why do you think the fuckers watching the Chicago security guard getting beaten only started screaming when the guard unholstered his handgun?