Phones can start recording at an instant these days. I'm sure when the women started insulting him the customer pulled out his phone to record it. However, I must make a statement that some people seemed to have missed. This young man has used a gun before, when he was convicted of killing a fellow classmate at the age of 18 over an argument. So, if he had a gun, he would have just killed these two women instead. His force was excessive but they were extremely rude and even violent towards him so I agree they got what was coming. But, knowing this man's background I think that he has anger issues and poor impulse control, evidenced in the murder of his classmate which landed him in jail for 10 years. So, in the end, guns would not have made this any better but simply worse because now there would be two murder victims and a man in jail for killing them.