Shopping mall, crowded places, full of tourist, office people walking around nobody expect any things can go wrong. Not trying to tell you to be paranoid but stay alert. In the public places, there are some emergency situations that you should be fully aware off. Fire, earth quake, and violent.
The recent gun fire in Siam Paragon that caused three death and five injury. Of course, who knows that a lunatic will drag a gun into a shopping mall and randomly shoot to people. This is an advise. Stay alert of your surrounding. Any alarm you hear or announcement through the public address can save your live. STOP-DROP and HIDE, find a place that you can hide. Try to calm yourself.
Violent
What will you do if you hear gun fired in shopping mall? Do not laugh at my question. This is my suggestion, STOP, DROP, and HIDE.