I'm new and I just had a quick question.
I'm going to be DMing a d20 modern on shot adventure for the first time. I am very new to DMing so many questions arise when making/creating the adventure.
One thing that I seem to be unable to find is how drawing a gun and firing would work before the real combat round has begun. For example, I imagine something like this: "Hero 1 is beginning to walk away but as he does, he draws his barretta from its holster and takes a quick shot at the man he was walking away from."
In this instance, since the "bad guy" wasn't expecting the "hero" to turn around and shoot, is this to be considered like a "got the drop" on someone situation? Would this just turn into an attack or does a surprise round happen where the hero gets to make an attack and then, assuming "bad guy" lives, everything turns into normal combat?
Any and all help is appreciated. Thank you.