It's a fantasy role-playing game.

DM: You are Percival de Rolo, a human gunslinger . You are the member of the famous group of adventurers. Previously, Across from the entrance is a set of wooden doors which he listens at. He hears nothing, but notices that the door is unlocked.
DM: Both arrows impact his chest. The duergar steps back for a second, surprised by the moment, looks really furious and begins to step forward, his size enlarging.
Player: I knock him right in the face with the butt of my gun as he rounds the corner.
DM: All right. Go ahead and make a stealth check to see whether or not he sees you.
Player: I can't use my previous stealth roll?
DM: Not for this point. This is an active combat.
Player: Damn it. Eight.
DM: Okay. So you still get the attack, but you don't have advantage, 'cause he's aware you're there. As he's running past you, he glances and sees you in the corner of his eye and is preparing for the blows. Go ahead and roll your attack.
Player: What do I add to this, by the way? I've never done a physical attack.
DM: You're hitting it with the blunt. Go ahead and roll a d20 and add your strength modifier and four.
