They never leave the premises, and it's implied that if the new recruit does try to walk out before the experiment runs its course, she'll be killed. The film also covers the man running the experiment and a new recruit for the program. They're then told only one can get out alive.
Mooks then burst into the room and kill the other subject, as that's what they're testing for (the experiment is meant to brainwash people into becoming suicide bombers). The only black subject appears to have the least will to survive, and when they're down to two members decides to kill himself in a Heroic Suicide. The sole female member is then immediately shot to set the stakes. Black Dude Dies First: The subjects are told they'll be eliminated one at a time in a psychological experiment.As he quickly shoves the gun in his mouth there's a gunshot, and bloodsplatter, then several other gunshots - the researchers have burst into the room and shoot his companion, as the test is meant to recruit people capable of sacrificing themselves in Suicide Attacks. The other has a gun with one bullet, so he decides to kill himself in a Heroic Sacrifice.