Another, perhaps more nuanced result of Druckmann's dramatic process, the enemies in The Last of Us are disconcertingly human. Eavesdrop on a trio of hunters before the start of a big fight and the overheard dialogue is steps above the typical guard patter.
The hunters converse, they chat; they talk about what they've had to endure to get this far. And once they're engaged, they call out to one another and work in a team. Ambush one, and he'll scream "he's in here", grab another as a human shield, and the rest will yell at you to drop him, with genuine panic creeping into their voices. The guys you kill in The Last of Us are groups of friends. As Druckmann points out, you're no better than they are:
^^ Pretty much like Batman Arkham City then.