The girls are given the task of learning lateral dressage and Sarah is especially determined to learn it. Rather than take it slow, she pushes Scarlet and herself to the maximum and ends up spraining Scarlet's leg during practice one day. Convinced that Scarlet is unable to learn it, Sarah decides to give up her determination; but when her and her friends are stranded in the middle of a river during a fierce thunderstorm, Sarah realizes that her determination may be the only thing that can save them.
