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, Pulling himself together, he circles past the herd member on top of him, looks over the side to see Pike, and inspires the cleric. Greenbeard, on the edge, limps to Kevdak, tells him to protect the herd, and casts Heal on the Thunderlord, Scanlan's Counterspell not strong enough to dispel it.
DM: You rolled a one? So, as you leap off the side, your foot hits the edge of the tile, and the blade behind you swings. Which I believe is going to hit you with a 20. Is that your AC?
Player: My AC's 18.
DM: 18, yeah. You take seven plus four, 11 points of slashing damage.
Player: I'm fine with that.
DM: The blow, however, is just enough to throw you off-kilter, and you go plummeting down into the alleyway.
Player: Okay.
DM: Falling prone. You can use your movement to get back up, the remainder of your movement, but you can't move from there. The fall does deal an additional five points of bludgeoning damage.
Player: Don't care.
DM: All right, so you get back up-- You're now in this alleyway right here facing this line here is all you can really see from your perspective.
Player: Who can I see from my perspective?
DM: You can see Vax, you can see Kevdak, and you can see this dude here, and an archer, but has partial cover because of the--
Player: Okay, I'm going to, as a bonus action I'm going to do a quick heal.
DM: Okay. Second Wind?
Player: Second Wind. Just to make that go away. God, that's amazing. 18 back, so, I've got--
DM: Second Wind, man.
Player: And ow! I'm going to pull out the big gun and I'm going to take a nice heavy serious look at Kevdak. What am I going to hit him with? I'm going to take a sharpshooter shot in his face. I'm going to go for a headshot with the big gun.
DM: A headshot? With the big gun?
Player: A headshot. With the big, with sharpshooter.
DM: Right, so you're using the trickshot on him.
Player: Trickshot on sharpshooter. I'm doing a combo. 23 to hit.
DM: That hits.
