Tonight on AC360: Together for the first time Georgia school standoff hero Antoinette Tuff and 911 Operator Kendra McCray speak to Anderson about negotiating the gunman's surrender.

It may have seemed like a miracle, that the standoff at the McNair Discovery Learning Center ended without anyone getting hurt. But it's no longer a mystery how it happened. Bookkeeper Antoinette Tuff was in the front office,barricaded inside with the gunman. He was armed with an AK-47 and five-hundred rounds of ammunition.Tuff put her life on the line. Armed with nothing more than her empathy, life experience and the guidance of a heroic 911 operator, she convinced the gunman to surrender. It was that phone connection to 911 that recorded Tuff's extraordinary act of heroism.

Anderson discussed Antoinette Tuff's heroic actions with CNN's Martin Savidge along with Psychologists Kris Mohandie and Jeff Gardere.