They could issue everyone two of them with enough cord to make nunchucks.
Still not going to be much use against a gun.
I’m afraid the teachers are going to look like the arab guy with the fancy scimitar moves in the Indiana Jones movie that Indy dispatched with his pistol.
The only chance for teachers going up against an armed assailant with such a weapon is a coordinated attack or an attack from behind.
I think wrist rockets would be a better idea.
A coordinated counter attack with 32 caliber shot from wrist rockets would quickly bring a shooter to his knees without killing him.
Provided no one shoots him through the eye. Body shots only folks