You know that how?
The mans own words. He said when interviewed that he was always armed. He also said when interviewed that he would rather die than go to prison. Others have said he was always armed.
I did not know the man and was not there, but I did see him interviewed and he said that. Other members of the group said it.
The others complied and are still breathing. The one anomaly who said he would die before he went to prison, said he was always armed, and took off in the car and bailed from the vehicle and put his hands down towards his waist was the one that was shot.
Again, people see and think what they want to see just like the protesters at Ferguson.