Wally has told them that "Lincoln" watches the restaurant and "Nixon" watches the parking lot. But Andy and Lew see Wally yelling at Hakim in the kitchen on the monitor marked "Nixon". Moments later Simon and Lew see George in the parking lot on the monitor marked "Nixon".
Wally: (Seeing George on the parking lot monitor and mistakes him for a thug threatening Andy) Finally. I get to administer 'Frontier Justice'. Today, I am an American!