So do you REALLY think they could have just walked out like that?
If I was in Iris position I so would have shot Lucas too. Not only because he might shoot me but also because not for one second would I have believed that I could just walk out with no consequences. I would have been sure that they would have killed me. I mean the police would be told and even if they were in it as well one could just go to the media and they would do some research and digging and everything might come out. No way in hell they would have just let them walk out! The host had been super-unfair before. Amy did not even get the chance to survive, she was pushed into the barrel at a fatal moment. And the second game was way more dangerous for Travis than for anyone else, he really did not have the same chances.
I totally would have shot Lucas, not for the money but just so that I survive.