Original sentence: In the episode "The Shakespeare Code", Martha wonders if she is safe in an era before emancipation, but the Doctor is blasé – when she prompts: "[I'm] not exactly white, if you hadn't noticed", he is nonplussed, ethnicity being irrelevant to him
Edited sentence: In the episode "The Shakespeare Code", Martha wonders if she is safe in an era before emancipation, but the Doctor is blasé – when she prompts: "[I'm] not exactly white, if you hadn't noticed", he is nonplussed, ethnicity being irrelevant to the open-minded