Was Reggie Nelson's Hit on Le'Veon Bell Dirty?

With 6:38 left to go in the third quarter of the Pittsburgh Steelers' win over the Cincinnati Bengals on Sunday night, Pittsburgh feature back Le'Veon Bell was knocked out of the game after a hit by Bengals safety Reggie Nelson in the area of his knee.  It was an injury that left the Steel City holding its collective breath, as the Steelers prepare to take on the Baltimore Ravens in a Wild Card Game next week. Bell has been a dynamic double-threat this season, and he will be crucial to Pittsbur...