Irony In The Twilight Zone?

In my opinion, poetic justice is displayed in two ways. When the man and women first encounter each other, they are flabbergasted by seeing another human presence and begin to fight. The man beats down the women and takes the food that she was going to eat. He then feels the need to go back and help the woman; lying unconsciously on the floor at the time. This act of nobility and guilt in my perspective is poetic justice, not served but realized.

Both of the survivors keep searching the destroyed town. The man grabs a dress off a manikin in a store and gives it to the woman, as an act of reconciliation towards the woman. The woman then takes the dress and goes inside a Recruiting Office to change, while inside she sees pictures of war propaganda. This is a crucial scene in the episode because the women has some sort of insignia on the back right side of her suit, and in one of the war propaganda pictures the slogan states, "The Enemy Meets Our Troops." And the enemies are those soldiers who have that same symbol sowed on their uniforms. The women finds out that her so called "companion" is on the opposing force in the war, and shoots at the man. The man is surprised by this and walks away in awe and disgust. A few days later the woman comes back in regret, the man consoles the woman and they walk away together in harmony. The poetic justice is seen again, in the same manner.

Another way that poetic justice is displayed here is the fact that both people work together, keeping in mind that their enemies in the war. They manage to overcome that disagreement and instead begin solving the problem at hand, which evidently is the extinction of mankind.