Here is the quote and it is hardassed with no profanity....:
Bryan: "I don't know who you are. I don't know what you want. If you are looking for ransom, I can tell you I don't have money. But what I do have are a very particular set of skills; skills I have acquired over a very long career. Skills that make me a nightmare for people like you. If you let my daughter go now, that'll be the end of it. I will not look for you, I will not pursue you. But if you don't, I will look for you, I will find you, and I will kill you".
Awesome as done in the best Jack Bauer...too long for an Eastwood threat, maybe Clive Owen could do this line, and too much explanation for Russell Crowe, but this is one of the great get even lines in movies.
Charlie