According to the rule of thirds our eyes should be drawn to Mr. Keyes. He displays a casual face and the director gives no other visual hints that anything serious is going on.  It's good to take note there are several scenes were Neff lights a match for Keyes' cigar. Neff is also always taller than Keyes when he lights the match, giving Neff the power of the situation. The match is also "normal" or calm, it isn't blazing bright as we compare it to our next picture.

                 
                           Here as well, according to my poorly drawn rule of thirds do we now see Keyes lighting the match for Mr. Neff. Both characters take the same placement as they did in the previous image, but Keyes now stands over Neff. This displays that the tables have turned, Mr. Neff is no longer in power of the situation he started because Keyes is above Neff. The match is also very bright--it seems to be lighting up Neff's face and the detail of the sweat and strain show on his face. The cigarette is limp, dangling from his mouth as he sits in this slumped position clearly being inferior to Keyes. This image is also darker than the first, indicating that the dirty truth of Neff's actions are out.