Mack Brown Concerned with the Unknowns of Syracuse's Blitz D Posted Sep 11, 2020 While Syracuse is worried about stopping North Carolina quarterback Sam Howell on Saturday — Mack Brown is concerned about protecting his star signal-caller. A major storyline throughout UNC's preseason has been the lack of depth on a Carolina offensive line that allowed 37 sacks a season ago. The Tar Heels have six offensive linemen in which they feel confident. (Inside Carolina)