Machinima posted a second video (you can check out the first one here) taking a look behind the the voices of Booker, the protagonist, and Elizabeth, the person he has to rescue from the evil Songbird.
Ken Levine, the creative director of Bioshock Infinite, is at the reins, helping them get a sense of what is going on. Things get intense, as we see how they prep to do intense scenes. You sometimes need to be brutal to get the tears flowing, all in the name of authenticity. You gotta love their hard work and motivation.
Bioshock Infinite is shaping up to be as passionately made as the first one and wanting to deliver on all fronts, including gameplay, but story and characterization as well. Check out the video after the break.