Hero dad describes split-second decision to defend against school shooter

On October 15, 36-year-old Kaylub Giamanco, while driving by Silver Rail Elementary School in Bend, Oregon, witnessed a shooting and intervened to stop it. He was heading home for lunch when he saw the gunman, later identified as Griffin J. John II, age 16, fire at a passing pickup truck before forcing his way into the school where his two daughters were students. Giamanco entered the building after following the shooter and found him struggling with an unarmed teacher inside a classroom. The teacher's distraction provided Giamanco with an opportunity to attack the gunman, leading to his death. In his first network television interview on "CBS Mornings," Giamanco described going into what he called "mission mode" as he analyzed the situation and acted decisively to protect others.