” And why did the other guy think spraying the terrorist with a fire extinguisher would do anything? “
Actually a dry chemical fire extinguisher makes a fine defensive or offensive weapon. Imagine taking basically 5 pounds of baking soda and blowing it in someones face at about 125psi. Their only thoughts after that is trying to breathe. You have probably 30 seconds to get in and neutralize the threat.
A dry chem would probably be my number 1 pick for somewhere I had no access to a firearm.
The dry chemical under your eyelids is going to painful and blinding.