The trivia item below may give away important plot points.
Kenny Johnson, who plays Kozik, gets blown up when he steps on a landmine. Johnson was on the series The Shield (2002) which was written by Sons of Anarchy creator Kurt Sutter. In his final episode Johnson was blown up and killed by hand grenade given to him by his a fellow officer. His line "You've gotta be sh--n me" was probably a blend by Johnson or cleverly written in by Sutter because of Johnson's connection with The Shield.