Where to run to: every store has at least one emergency exit in addition to the front door. Run in a store, head to the back. The fire exit may be alarmed, but that's OK. I'd feel a lot better running through the parking lot than being in the mall with a shooter.
Can you confirm that from experience? Do all the little boutique shops have exits in the back (I assume to a service entrance). Not being critical. I've never worked in a mall so am only surmising they do and was hoping you can confirm.