Friendship is Dragons

DM: Gallus–
Gallus (RD): Yeah great just tell me what I gotta do to get outta this mess!
DM: Uh… you alright?
Gallus (RD): <sigh> You did it. You finally did it. You found my one fear.
DM: Claustrophobia?
Gallus (RD): Not exactly. Crushed to death… by a puzzle. A puzzle that I'm just too dumb to solve in time.
DM: Oh… Wow. Sorry. For the record, I don't think you're dumb. And this puzzle's pretty simple. The purple beams made the cavern contract, so the teal beams…
Gallus (RD): Oh.
DM: So the challenge is just a matter of Dexterity. And, uh, I think I'm going to take a break from psychological mind-games after this.
Gallus (RD): Good.