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I feel like the producers are trying to show us that Rick's group of survivors has already passed into the realm of being fairly fucked up and ruthless.
There have been several examples so far in the show, such as Andrea jumping the fence just to kill some zombies, the people in Woodbury being blown away that a group of 10 could clear our the entire prison, Michonne holding back when they first encounter the swarm to see how they fight, and then Michonne demonstrating how battle hardened she is by spearing the guy in the cabin.
In the comics it kind of becomes a thing too, when Rick and his group meet other survivors they are often appalled at how violent they are.
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