It's a simple enough matter to store nearly all of your human tissue and scuttle away. For anyone observing it will simply appear as though you've dissapeared entirely. Though you are slowed down considerably by your smaller size, it's likely worth it to avoid notice while the city focuses on the inevitable search and rescue efforts at the mall.
As you begin to abscond with the bodies of several hundred of the very people that the city will be looking for you take stock of whatever possessions happen to have been picked up and stored within the mass of gore. There are clothes, wallets, pens, pocket change, gum, and even a few guns. Actually, more guns than you might expect to find among three hundred or so civilians. Seeking answers to that particular mystery, you search among the chorus of minds for an answer. What you find is intriguing. A small time warlock who had recently moved here to Darkgate City to start a criminal organization happens to be one of your many minds. One of the local mob bosses was unhappy with the idea of more competition, and put a hit out on the man. In desperation, as a few goons cornered the warlock in a public bathroom, he called out to you, the demon lord he served, asking for help. It's his warehouse that was offered up by the collective as a potential place to hold up safely. Well isn't that interesting, you imagine that's why you ended up here. After getting hit so hard by one of those cosmic horrors from beyond called "Angels" that your conciousness was cast off into the ether, you were likely attracted to that one open metaphysical line.
As you inch, block by block, closer to the warehousing district you seek you find that the sun has reached the highest point in the sky. Your perception of time probably isn't as accurate in this world as a human's might be, but it's probably been five hours or so. It might be safe to take a human form now, and it's difficult to imagine a human noticing you escape from the rubble, as you've shrunk down to the size of a cockroach. If you really wanted to you could shrink all the way down to single celled life, but there are some pretty severe limitations to taking up such a small space.