He goes from confused and a little annoyed to amused in a matter of seconds. This is too good, "You wish to stamp out evil wherever you go? How very noble of you. But you know some of the residents here must also be villains, that's just basic statistics. What shall you do about them?"

The crabs seem to have gotten the message and are giving them a wide berth. "I think you've taught them a lesson they shan't soon forget."