In case you will find yourselves in the center of a mass knife attack and you can not escape then you should try to neutralize
the perpetrator. To succeed you must act in groups. If the attack occurs in a mall two or three people in the team using supermarket carts can immobilize the loony while the others will attack him with every item at their disposal. Fire extinguishers, bottles, cans, any heavy object or tools.
We never try to disarm the culprit with bare hands unless we have no other choice and we are with our backs against the wall.
PS If you are living in the free world and you got a concealed weapons permit just make sure what is behind the goblin and send him to meet his forefathers.
NEUTRALIZE NOT JUST DISARM!!