It's a fantasy role-playing game.

DM: You are Nott the Brave, a goblin rogue . You are the member of the famous group of adventurers. Previously, The rest of the party creeps closer and the guards are alerted by Keg's lack of stealth. Meanwhile, Shakäste has gotten both hands free and removed his gag, and casts Spiritual Weapon, which misses, but he is able to pick the lock of his cage and step out.
DM: Not bad. As he dodges the first one, the other one-- He tries to duck out of the way and instead, you see it vanish into the cloak. At first, you thought it just passed through harmlessly, but you hear an "Ugh!" and he falls and limps against the wall for a second before looking up in your direction with a snarl.
Player: (yelp)
DM: All right. That finish your turn?
Player: Have I done all of my movement? Yeah?
DM: No. Technically, you still have about 15 feet.
Player: I'll just duck over towards Shakäste so I'm not right in eyeline of either of the hallway baddies.
DM: You go to duck over towards Shakäste, and your face hits something that's not there. It's like some sort of invisible force.
Player: Why do I keep running into things? I need contact lenses.
DM: You immediately recognize the familiar scent of Caleb's coat right in front of you.
