[Charles gaped at him, open mouthed for a whole two seconds before quickly whispering his response, so be glad he's at least that capable of being inconspicuous.]

Erik, you can't kill a federal agent! They'll kill you for something like that! [And, perhaps more confusingly and/or importantly, because for all he knew now he was an accomplice to this:] Why are you telling me this? I thought you just owed someone a debt or something.