Calm down, mom. It’s not a new Black Sabbath song (although, if it were, I’d be listening to it...RIGHT NOW). No, it’s a reference to a well-known football term: ‘Special teams demon’. Basically a player that, for whatever reason--juniority (yeah, I made that word up), lack of experience, or just being unable to otherwise crack the depth chart at their respective position—receives the bulk of their playing time on special teams, but attacks their role with the reckless abandon of a man possessed. A demon, you could say.
Weak side to strong side, Boise State’s linebackers are...*searches for appropriate superlative—fails*.