"I was very sore the next day and I wasn't the one being beat up," Chinlund says. "We were losing the light a little bit so time was an issue. It added to the urgency of getting it right so everyone was very focused."
Luckily, the actor he had to beat down on-screen, Jack McGee, was up for anything. "He's game. He's like, 'I'll go over the bar,'" Chinlund says.
The fight is part of an episode investigating the death of a Wall Street hot shot with many enemies. Chinlund plays Jack Driscol, a Bronx businessman with a specialty in money laundering, among other enterprises.
Get a behind-the-scenes look at the fight:
Law & Order: Criminal Intent airs Sunday at 9/8c on USA.