It's a fantasy role-playing game.

DM: You are Vax Vax'ildan, a half-elf rogue . You are the member of the famous group of adventurers. Previously, Vox Machina made the relatively grim journey back to the mountainside, finding it now brimming with volcanic rock and volcanic activity that previously lay dormant. Upon climbing the side of the mountain, you found remnants of the Pyrah tribe still alive and making their way up the mountain, as damaged as they are, in hopes of sealing this now progressively swelling tear between the prime Material Plane and the Elemental Plane of Fire.
DM: Both just (fireball impacts), cracking into the ground to the sides of where you're standing, barely missing them. It keeps glaring down at the rest of you with a smile. Ending that, it brings us to Vax. You're up.
Player: I got a high stealth right beforehand, so am I hidden at the moment?
DM: As far as you know, depending on the individual. You don't know who saw you and who didn't.
Player: As far as I know. All right. Balls. I'm just going to throw three daggers at the salamander, right from where I am.
DM: Right from where you are? All right.
Player: Yeah, okay, so. First is a 20, second is a 14, third is a 19.
DM: Okay. The first one was what?
Player: 20.
DM: The first and the third hit. If you are hidden, though, which you would technically be hidden from this individual, you do have advantage on those attacks, so you can reroll the--
Player: And if I'm hidden it's a surprise, right? On that guy? You tell me.
DM: No, no, it's a sneak attack if you're hidden. A surprise round is if they have no idea that you're there.
