Did anyone else notice how Iris did a 180?
In the first round she's paired off with the the black guy and we see that she chooses to electrocute herself rather than electrocute him, which showed us the audience that she was a woman with integrity and morals and preferred to suffer, rather than inflict pain on someone else. Now, fast forward to the last round, when she's paired off with the guy who just sliced his own eyeball. She's given the option to walk away and not hurt him, but she chooses instead to shoot him dead.
At 1 hour in when Cal kills Travis and he sits back down and says out to himself that it had to be done, Iris looks at Cal saying, NO, you didn't have to do it.
All of these actions from Iris went completely counter her final action. It's just hard to accept the fact that she completely changed as a person at the end of the night from this other person she had been all night. I suppose the director wanted us to be in shock at her decision, because he groomed us all through the movie in believing that Iris would not be capable of hurting another person, let alone kill them (and especially someone who had been caring with her all night).
Do you guys think that her transformation was realistic? Did her core belief system change that radically in the course of a night, where she can go from a caring, decent and moral woman, to a cold blooded murder?