SERIES The Amazing Race The racers take on a 40-foot plunge before they get to a double U-turn. 8 p.m. CBS Grimm The assault on Sgt. Wu (Reggie Lee) has a surprising effect on him. 9 p.m. NBC The Originals Cami (Leah Pipes) is in desperate need of a cure and as he stays with her, Klaus (Joseph...