You are licensed and carrying on a road trip outside your local area when you stop for fuel. While your vehicle is being serviced you get the urge for a candy bar and venture inside the mini-mart to see what they have. You get your candy fix and realize it would go great with an ice cold Cola and you move to the rear of the store where the liquid refreshment is on display. You find your favorite on the bottom shelf (of course) but, while trying to dig one out from the jammed up display you hear someone arguing at the checkout. You rise up to find the clerk being held at gunpoint and two masked individuals demanding money from the till. You initially fear for the life of the clerk because the perps are very demanding and verbally threaten to kill her. The clerk is visibly shaken and has lost grasp of what is happening, unable to follow any of the demands being made of her. The situation worsens when the one assailant with the firearm fires into the row of cigarettes behind the counter and repeats the demand for money. You have your weapon drawn and from your position you have a clear shot at the gunman from twenty feet. What do you do now?