So if we're discussing basketball, and I say "Now let's talk about baseball," I can expect you to object on the grounds that baseball isn't relevant to basketball?
Have you ever discussed any subject other than the common law, perchance, or do you find the changing of subjects simply too wrenching to carry off?*
* Note multiple question marks.
Ah, you were just changing the subject.
Can you say "disingenuous"?