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, The frost worm bites Keyleth, who casts Blight as payback and heals herself. you asks Pike for healing, then hits the visible worm.
DM: It's going to burst out from the ground where you and Pike are as the last motion that it felt was you rushing over across the ground. (boom) It comes tearing through, making its bite attack against you and its tail attack against you as well, because of Pike not moving.
Player: Question!
DM: Yes?
Player: Pike probably doesn't, but do I have any advantage being that I'm in this little closed-in bubble?
DM: Technically, no, because it has reach. And it just kinda swerves around the inside and it knows this cavern pretty well as it's been through here a few times. So. That's going to be a 23 to hit on you?
Player: Of course that hits.
DM: For the bite attack.
