Shadow warrior (maze runner story)

Many believe that Alby was the first person in The Glade, but was he really? The Gladers are starting to get suspicious when Alby sneaks off into the deadheads every so often, sometimes with fresh meat. Is he hiding something? Or is he hiding someone? One day, a few of The Gladers, curious about what Alby keeps going in for, decide to go for a wander in the deadheads, and find the place littered with broken arrows, animal skulls and some human tracks, too small to be Alby's. The Gladers are shocked when a single arrow in fired at their feet, which was followed by two more. Terrified of what it was, The Gladers run back to The Glade, wanting to know what was in there.