A 45-year-old man is brought to the emergency room complaining of intense pain in his left calf and ankle. The patient gave a history of playing tennis where had lunged forward, heard a "snap," fell to the cou in tremendous pain, and could not walk. On examination, the left calf was tender and indurated, with an irregular mass noted in the back of the mid-calf area with the following finding. What type of excessive abnormal ankle movement would be present?