having worked at a mall, i need to say that every single store has some sort of exit, even if they share one with a couple stores connected by a hallway running behind them all. The SPCA Adoption Center I worked at shared one with several small stores. This info might save your life.
Yes, I was going to point this out, too. If you hear anything at all, any type of ruckus, go to the back of the store and notify the person at the register.
To tell you the truth, I'd find a way to get that cage pulled down over the front of the store, too. If the cage is down and there is no-one visible from the front of the store, you might have a chance of getting out through the back hallway.