The robbers started this with an advantage of initiative, numbers, preparation and mental preparedness. This is why the ambush is the most effective form of attack. If the shop owner were to react at this time, he would lose the majority of the time.
This shop owner feigns submission, waiting until the robbers are no longer focused on him and draws to fire when they are at their most vulnerable. This is a counter-ambush.
Some of the most incredible combat footage ever captured on film. There is not much else to say other than it must be watched.
Mugging victim feigns compliance by raising his left palm to the mugger, parries the gun away with the same hand while concealing the draw of his own gun with his right hand and shoots the mugger, all within a couple of seconds.
Victim perfectly distracts mugger by dropping wallet, hiding his draw by stepping around another person and drawing from the hidden side without making any sudden or aggressive movements to indicate that he may put up a fight.