Walmart Employee Throws Down On Customer Then Bans Him

This happened in Wilmington, North Carolina. The man filming went into the Walmart and saw a shoplifter. As he attempted to film the thief, this unidentified man tells him to put the camera away and follows him into the parking lot, even shoving him at one point. He was apparently a Walmart employee, though not in any uniform, and tries to ban the guy with the camera…but why?