[Luther] Why did Ripley turn on Luther so quickly?

Luther hadnt done anything that Ripley hadnt seen before. why the quick turn around. Also I cant see someone going after a man who gets results even if they are breaking the rules. It would be one thing if he didnt get results and didnt have a moral code but he does get results and he does have a code. via /r/television http://ift.tt/2eZGTrc