(at around 39 mins) When Sam is searching for Alia/Angel and Vivian (the helpful guard) (in what appears to be the basement), Sam finds Vivian who asks "Sam, what the hell am I suppose to do"? She should not know that Liz is Sam until the very next scene. See more
[Vivian is helping Sam and Alia escape
Why are you doing this?
Does it matter?
Yes. I wanna know why some people help other people.
'cause all my life, I never did anything really special. And if one tenth of what you've said is true, then this is special. For once, I wanna be the good guy.