It's a fantasy role-playing game.

DM: You are Taryon Darrington, a human artificer . You are the member of the famous group of adventurers. Previously, They make a circuit of the volcanic cone, finding a small hole that Grog is able to punch wide enough to admit all of them. They navigate their way through a combination of air- and water-filled tunnels, using water from Grog's Alchemy Jug to breathe through the sections that have only deoxygenated air.
DM: Well, you've moved maybe 15 feet. I'd say you probably have, at his flying speed, maybe a third of his fly speed left.
Player: That's another 40 feet.
DM: (chuckles) So there is that.
Player: All right. Well, then you guys got this well in hand. I'm going to fly to the other guy. Is he going to get an attack on me?
DM: This guy here?
Player: Yeah. As I fly up high?
DM: You fly to him and you're gliding above right now.
Player: No, I'm going to go to the furthest guy.
DM: Over here? (gliding noises) Okay. You're currently floating above the lava. It's not affecting you as you (whoosh) fly by. Because you're flying, no, I will say the mom bulette does not notice you pass. It does not get an attack of opportunity.
Player: (whispering) I'm the Crow.
DM: Essentially. All right, that ends your turn. Vax.
