have been an earthquake in the building was collapsing. so that was the point when i just told my kids to lie down. of course, i am scanning the area wondering where we are going to go. >> scenes captured on security cameras in the mall, showed how quickly the attack and began. you can see machine gun bullets flashing down the main concourse, as shoppers frantically scramble and dive to the floor. >> and then i saw rounds starting to hit the shops that were straight ahead. >> katherine's first thought, protect her kids. >> it was just instinct to grab the girls and run. but we must not have gone very far. a kenyan came and scooped up portia. and we both ran right behind this display table, display cabinet. >> katherine, her girls, and the kenyan woman to cover the only place they could. here they are crouching under a flimsy temporary display table.