“Concussion” marks another dramatic turn for Will Smith, and it marks one of his boldest and most powerhouse performances to date. Even if the rest of the movie is not on par with Smith, it mostly makes it to the end zone with him carrying the movie on his shoulders. Smith stars in this real-life story of Bennet Omalu, a forensic pathologist who made valiant efforts to prove that there is a direct correlation between head trauma and injuries football players suffer on the field.