I was on the top floor of a mid-rise building with my parents. We were trying to get onto the roof for safety from the “zombies” after us. We had until the “isolation sphere” ran out, which was some kind impenetrable force field that secured the upper floors from any intruders. I scrambled through the mess of random junk on the floor in search of a bag and calculator before the safe period was up. Just as the field dissolved, I jumped out the window and onto the roof.