By Mike McDaniel Miami was preparing for its matchup with Cincinnati on ‘Thursday Night Football.’ View the original article to see embedded media. As the Dolphins prepare for their Thursday Night Football tilt with the Bengals, the NFL has opened an investigation into whether or not their final walkthrough practice was being filmed, according to a report from Barry Jackson of the Miami Herald. Dolphins’ personnel identified people observing their walkthrough practice, and according to a separate report from NFL Network’s Tom Pelissero, the team was one step ahead. Per Pelissero’s report, Dolp…