Lions defensive tackle Ndamukong Suh has received some criticism after being flagged for roughing the passer in the team's preseason game against the Bengals on Friday night. Suh slammed Bengals quarterback Andy Dalton to the turf as he was releasing the ball. He was called for four personal foul penalties last season and was fined twice. "You can ask Kyle (Vanden Bosch), the tradition we have at Nebraska, the Black Shirt tradition, is one of aggressiveness and imposing your will on any player that's opposing you," Suh said. "With that, we play at a very high tempo. ... That's our nature. That's how I grew up in the game of football." As for those who might judge him as a dirty player? "There's always a fine line between dirtiness and aggressiveness," Suh said. "I know to this point, in my own heart, I haven't crossed that line by any means."