Of the many narratives heading into Sunday’s Lions-49ers game, Metallica’s thoughts on the game don’t rank particularly high. But thanks to a comment on a Detroit Lions Instagram post, we know where the legendary metal band stands heading into the NFC Championship game. A Wednesday post on the Lions official Instagram feed invoked the lyrics of Metallica’s “No Leaf Clover”: “The soothing light at the end of your tunnel was just a freight train comin’ your way,” the caption reads, underneath a picture of Lions second year defensive end Aidan Hutchinson emerging from a smoke-filled background, m…