(electronic) communications jamming

Exploration Stage: Foggy Backstreet
From: Mr. Black
Description: Keira Woodville is a fighter with a work ethic. I don't understand why she insists on those boring puzzles she received as a child. What? You need a "secret triangle"? Well, then find it for her. I want Keira back to work as soon as possible.
Completed: You found it. Hmmm, this is interesting... it seems that this triangle blocks extra signals coming into the communicator. It seems that the pyramid of fireflies that Keira got from her father is no ordinary puzzle...