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, Across from the entrance is a set of wooden doors which he listens at. He hears nothing, but notices that the door is unlocked.
DM: Okay. The 21 misses, the 23 hits. Because they have cover and because it's so dark it's difficult to make out their form, but you do manage to hit one with the arrow.
Player: Okay. I Hunter's Mark him.
DM: Okay. Next time, make sure you do that before you attack. Otherwise it won't count for the attack.
Player: Okay. Okay. 13, uh, 12!  Math! Stay in school.
DM: All right. There you go. 12, then add your Hunter's Mark bonus to that as well.
Player: Oh, good, one.
DM: All right, gotcha. So one arrow sinks in the shoulder, but doesn't appear to be stopping his angry advance towards Tiberius. Let's see. You're staying where you are?
