Tomlin says post-game incident with Nelson was unrelated to hit on Bell

A post-game discussion between Steelers coach Mike Tomlin and Bengals safety Reggie Nelson started fairly innocuously — before becoming heated before resulting in Bengals coach Marvin Lewis breaking it up.  The initial assumption was that Tomlin either objected to Nelson’s low hit on running back Le’Veon Bell or to Nelson’s arguably taunting after inflicting a…