Three things wrong with this video.
First, mass murders don't dress like the bad guy in this video. That's how the good guys dress. Mass murderers dress like you.
Second, there is no need to improvise weapons if you are carrying a concealed gun and defensive folding knife. And you should never use or rely on tools and equipment you do not know how to use, so unless you are trained in the defensive use of a folding chair, you should not do this.
Third, do not use the term "active shooter". The "active shooter" you see might just be the conceal carrier saving your life. Having and shooting a gun does not make you bad by itself. That thinking is, in part, how we got into this mess.
First, mass murders don't dress like the bad guy in this video. That's how the good guys dress. Mass murderers dress like you.
Second, there is no need to improvise weapons if you are carrying a concealed gun and defensive folding knife. And you should never use or rely on tools and equipment you do not know how to use, so unless you are trained in the defensive use of a folding chair, you should not do this.
Third, do not use the term "active shooter". The "active shooter" you see might just be the conceal carrier saving your life. Having and shooting a gun does not make you bad by itself. That thinking is, in part, how we got into this mess.