It was an identity call, as FOX analyst Charles Davis so aptly put it during the game broadcast.
Whether in Tennessee, St. Louis, or now Los Angeles, Jeff Fisher's identity has always been tough, physical football. Run the football, bloody the opponent's nose, and win with toughness.
So on fourth down, with less than two feet separating the Rams from the end zone at the end of the first half, there was nothing to think about in Fisher's mind. Go for it. Hand the ball to your Pro Bowl running back, Todd Gurley, against a Detroit unit that was last in the league in red zone defense entering the game.