Head had been in the stairwell 90 minutes when a door from the supermarket opened.
"The lights came on in the stairwell, and people went out. I was very, very hesitant because ... there was no information to tell me it was safe to exit," she said. "It was just that the people in front of me were exiting."
"People were saying be quiet," she said. She saw drops of blood on the floor as they walked through the hardware section and a cereal aisle and then through the storeroom to get outside. Still they walked quietly until it seemed safe to make noise.
Then they ran, she said, not stopping even when they reached crowds of onlookers and photographers.
Tear gas, then rescue
Kaigwa-Okoye heard firing but then realized police had arrived on the floor where he was hiding in the restroom. They were firing tear gas.
Officers told them to walk out single file and made them throw away their bags.
Kassam had been hiding in the back of the supermarket for more than two hours when a security person arrived and said it was safe to flee. She and others walked through a storage area.
"We saw lots of blood, sandals and shoes," she said.
She made it outside to the main road.
And even at what seemed a safe distance, she again heard shooting in the distance.