if your smart you would take that chance to create distance and find cover. after all distance and cover would be a better first choice tactically speaking.
besides you would probably end up shooting your foot the ground by your foot and then the ground again as you attempt to draw and engage in that situation.
im not putting you down as 75 percent of us would do the same thing as its a rather common occurrence when in this situation where you have to quickly draw and engage as fast as you can. you finger receives to pull the trigger signal faster than your arm can receive and act on the draw and point signal.
i think you idea is a bit too much Hollywood but if it works then your lucky. its better to try then stand there and **** your self.