It's a fantasy role-playing game.

DM: You are Scanlan Shorthalt, a gnome bard . You are the member of the famous group of adventurers. Previously, you moves towards the mouth of the alleyway to try and get out of the erinyes's line of sight. He once again prepares to cast Otiluke's Resilient Sphere when Ghurrix is in range.
DM: The sniper can still get you. With 25 movement, you can't get far enough away, unless you want to use your action to dash.
Player: No thank you. How high, he would be--?
DM: Actually, technically, you used half your movement for prone, so you can only get that far.
Player: Oh. Is there anything I can hide behind?
DM: Currently, no.
Player: Can I hide behind Pike?
DM: You can't get that far.
Player: Jump in the lava?
DM: If you want to.
