Surprised it hasn't been mentioned yet (unless I missed it) but there was an armed CHL holder in the mall who chose not to fire due to bystanders.
Meli, who has a concealed carry permit, positioned himself behind a pillar.
"He was working on his rifle," said Meli. "He kept pulling the charging handle and hitting the side."
The break in gunfire allowed Meli to pull out his own gun, but he never took his eyes off the shooter.
"As I was going down to pull I saw someone in the back of the charlotte move and I knew if I fired and missed I could hit them."
Meli took cover inside a nearby store. He never pulled the trigger. He stands by that decision.
Edit: I definitely missed the whole last page of discussion. lol