Derek Morgan:  You 've been with this team , what , 2 years , right ?
Emily Prentiss: Almost three already .
Derek Morgan: It 's _ seven _ for me . I mean , that 's all I can think of all day . 'Cause the entire time I 've been with the BAU , working almost non - stop , having no real life , these brothers have been out there killing 89 people and we did n't even know about it .
Emily Prentiss: Well , we know now and we 'll make them pay .
Derek Morgan: But how many others are still out there , Prentiss ? Hmm , hunting and killing ? I mean , the thing is , no matter what we do , no matter how hard we work , no matter how good we are at what we do , this is never gon na end .