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, Trinket, who had been sleeping outside Percy's workshop, attacks the one next to Percy. Jarett gets up and runs to the cell, unlocking the door.
DM: 17 damage, nice. Trinket runs up, coming out of his somewhat sleepy stupor, goes for a bite attack and grabs nothing with it, and turns around and rakes a claw backwards, manages to get the back of whatever this entity is, and you hear it scream (gasping scream). You do, at least.
Player: I have a technical dispute, really quickly. Could the wraith have gotten that far, since I knocked him prone?
DM: Yes, it could've, because it uses half its movement speed to get up.
Player: Oh, thank you. Never mind.
DM: Its movement is actually 50.
Player: Ignore me! 50?!
DM: Not that you know that. But it moved far for what you think it should've been able to.
