From a purely hypothetical point, if Cthulhu were standing in front of me, about to cast his ultimate world ending spell, Harry was a greasy smear on his left foot, all hope appeared lost, and Nic were standing next to me, even knowing all that I know about his team, if he offered me a coin to help him stop the impending destruction of reality, I'd saddle up with the Denarians and sort out the consequences later. Under certain extreme circumstances, I could see Murphy, even now, doing it. Its just that I don't see the story going there.