HUH?!?!?! A customer came into your store, you happened to catch a glimpse of his concealed, holstered gun, and you drew your gun on him???? Wow! I'd a lot rather run into the off-duty police officer described in this blog post, than run into you! I routinely carry concealed in Pennsylvania, and I'd press charges against anyone who drew a gun on me just because they caught a glimpse of my gun.
He is lucky I didn't panic and shoot
So are you. You'd be spending many years in prison if you had, as well you should be.
There is no point in your packing if you're going to stand there and say, "you go first". You'd be safer unarmed!