It's a fantasy role-playing game.

DM: You are Pike Trickfoot, a gnome cleric . You are the member of the famous group of adventurers. Previously, Tiny Vax, thanks to a potion that does that. Scanlan managed to go ahead and put in an Immovable Rod within its stomach, which held it up for a moment, before it decided to truly gain the advantage it needed to escape the circumstance, allowed it to tear through its body, as well as an arrow that was shot by Vex, towards her brother, in the hopes of, I don't know, being a symbol of hope?
DM: Okay. So you move over and leap up onto Grog's back, holding tightly. What's the trigger for your action that you're holding?
Player: On his next attack on somebody.
DM: The next time you sense the dragon is attacking somebody?
Player: Yes.
DM: All right. What action are you holding? Is it a spell?
Player: Yes.
DM: So you begin preparing the spell. You are now concentrating on it, as you're holding the back of Grog. Okay. Holding that bit, that brings us to Keyleth. What are you doing?
