Challenge page : http://www.ancientsocieties.com/fence/
The Challenge text says Watch the screen closely…
The close part of the picture given is a fence, like the name of the challenge, this is a huge hint to use railfence cipher to decode something.
In the picture, we have 5 groups of characters, from left to right :
PTBR ERSI ERPK HEWE GLYK
Using a railfence cipher decoder like http://geocachingtoolbox.com/index.php?page=railFenceCipher we get :
PRESTIGEBRLPRKYHEEKW
We can see the word PRESTIGE and some gibberish : BRLPRKYHEEKW
From PRESTIGE, we can think about the novel and movie The Prestige (http://en.wikipedia.org/wiki/The_Prestige)
In the movie, a journal as a special keyword : TESLA
We can use this keyword to decode BRLPRKYHEEKW, with a Vigenere decoder like http://rumkin.com/tools/cipher/vigenere.php
The solution is INTERRUPTERS
The solution page is http://stl.la/interrupters, this page is redirected to http://www.ancientsocieties.com/journal-keyword/