Sarah Walker:  No , it 's not the mission . It 's * everything*. It 's how he pulled out Casey 's tooth , and how he burned that asset a couple weeks ago . And the way he lies to Hannah . I mean , uh , it 's so easy for him . Chuck 's changing .
Daniel Shaw: Chuck 's becoming a spy .
Sarah Walker: I know ... But lives are being affected here .
Daniel Shaw: Sounds like he 's not the only _ one _ changing .
Sarah Walker: It 's like I 'm watching Chuck disappear , and the further he gets from who he is ...