"Excuse me, Harold, but I just remembered that I'm late to pick up my dry cleaning and they might give it away to a charity drive. I really must go."
Harold looks somewhat startled as you bolt through the emergency exit and down the fire escape. You glance back as you hear the faint alarm that was set off as you opened the door and wonder how you'll explain your strange behaviour to your colleagues. It doesn't matter, you decide- you needed to save yourself. As you reach the bottom of the stairs you wonder whether you should attempt to save the others, or focus on seeking refuge for yourself.