It's a fantasy role-playing game.

DM: You are Vex Vex'ahlia, a half-elf ranger . You are the member of the famous group of adventurers. Previously, Many of the townsfolk gathered at that square were immediately killed. The party, as well as a few other straggling survivors, ran away as both the gargantuan black and green dragons began to chase  them  down.
DM: No, unfortunately, the fog cloud is just high enough where it covers this area for you guys. However, you could jump off if you wanted to, make an acrobatics roll and then maybe do your attack afterwards. If you wanted to try that, your call.
Player: Wouldn't I still be in the fog cloud if I was on the ground?
DM: No, the fog cloud is elevated up here. It starts here and then goes upward. Keyleth created it in the air. You guys are at the base of it right now.
Player: So I can use my movement to jump down?
DM: Yes, if you want to.
Player: All right, I'm going to fucking Hunter's Mark him.
DM: You can't see him right now, unfortunately.
Player: I'm going to jump fucking down on the ground.
DM: So you jump. Go ahead and make an acrobatics check. As you leap off the highest part of the wall of your Keep, all of a sudden the fog dissipates and you see the ground rushing up towards you.
Player: 14.
DM: 14. You manage to catch yourself. You aren't knocked prone, but you do suffer five points of damage from the fall. But you catch yourself (grunts), get up, and now you can see at the very, very base of the fog cloud, the head peeking though and the wings occasionally (wingbeats) from out underneath, and you have visual on the dragon.
Player: Okay, I'm going to Hunter's Mark him. And I'm going to shoot him through the Sky Sentinel.
DM: You already used the Sky Sentinel if I recall against the green dragon, didn't you?
Player: On the worm.
DM: Was it the worm? Okay.
Player: And I multiclassed today, so I'm a rogue, so I get Sneak Attack on this.
DM: It currently does not have--
Player: Does it know that-- does it see me?
DM: You haven't tried to stealth, so technically yes. As soon as you jumped off and land, and hurt yourself and your ankle, you look up and it sees you.
Player: Never fucking mind. Balls, all kind of balls around here right now. The first attack is 25.
DM: 25 hits.
Player: The second attack is 24.
DM: Both hit.
Player: The third attack is 16.
DM: 16 misses.
