Thanks for checking out the book, and sorry it took so long to reply - I've been sick the past several months and have not been able to check in. "Carrion" is a bit obtuse - sometimes when I go for that dreamlike quality I stray a little too far off the reservation.
Unbound's antagonist, Sharpe, is the unnamed pursuer in this story. He's basically made a game out of stalking the main character until such time as he sees fit to end said game.