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, Three crossbow bolts come flying out of nowhere—two hitting Grog. They notice three duergar, with a strange, unfamiliar beast accompanying them:  a large brain with a set of claws.
DM: Well you can dash as your action, but dash is your, basically a double move. So you move and use your action to move as well.
Player: And that's it.
DM: That's all you'll be able to do.
Player: Um, I'm gonna-- no. I'll you what I'm gonna do. I'm gonna go-- hey, god. I'm gonna move over here, stealthily. And go for ready.
DM: Okay.
Player: That's what it's called, right? And wait?
DM: Just wait.
Player: And the trigger is when this asshole duergar moves forward, I'm gonna stick him in the back of the neck.
DM: Okay. All right.
