Once you were finished riding the elevator with 8, you both arrive at the highest level of the facility, and notice a bunch of corpses of guards who have been attacked by something on the same floor as you. Little did you both know, is that the guards dropped their rifles after dying on the floor in their own blood.
You grab one of the rifles as protection, but realize that you've never shot a gun before in your life, so this might have been a new experience for you. "Okay, all we have to do is find Dr. Steinburg, and then leave this place," 8 explains. "The thing is, I don't know which one of these rooms leads to an exit. Do you?" You shake your head, up, and down to answer no. "Well, I guess we'll have to go at random, and see which one has Dr. Steinburg inside, who can help us out," 8 says. "This is A-Class after all."
You look at all of the doors, and find that they have numbers on them like the other door you went through when you lost the president. So, you pull out your key card, hoping that one of the doors will open.