actually thought it was an earthquake and the building was collapsing. that was the point when i told my kids to lie down. of course i'm scanning the area wondering where we're going to go. >> scenes captured on security cameras in the mall show how quickly the attacks began. you can see machine gun bullets flashing down the main concourse as shoppers scramble and dive to the floor. >> and then i saw trace arounds starting to hit the shops straight ahead. >> catherine's first thought, protect her kids. >> it was instinct to grab the girls and run. but we must not have come too far and a kenyan woman came and scooped up porsche and we ran behind this display table, display cabinet. >> catherine, her girls and the kenyan woman took place the only place they could. here they are crouching under a flimsy display table.