"I know what you're thinking -- did he fire five shots or six? In all this commotion, I really can't remember. So you have to ask yourself, do I feel lucky? Well, do ya, punk?"
The question: Is Harry blowing smoke about having forgotten how many shots he has fired? Does he know the chamber is not empty when he pulls the trigger, or is he really unsure himself?
When the status quo is an acceptable place, it's not a bad thing to kick up some sediment, muddy the waters. People are unlikely to make a move until they can see the bottom.