I think we're getting somewhere.
And my point is not "Nicodemus would look into it on his own" it is "Nicodemus would keep track of what the Church believes about the subject, and attempt to prove/disprove their theories, because as a spymaster that's what he does."
This is still assuming a level of micromanagement that's probably completely unnecessary for an edge case that probably never, or almost never, comes up in any kind of practical sense. If it hasn't happened in 2,000 years, Nicodemus isn't going to give a damn about the possibility.
That is an absolutely accurate assessment of why Harry wouldn't question it (even though I like to believe that if he thought about it he would ask how giving up the one thing he has faith in is supposed to help him against the Fallen--but that's beside the point).
It's also just a reflection of how Michael acts and believes -- if he says something with certainty, it's because he's certain of it. He's not the kind of person who's going to lay out statistical probabilities of something working; he believes it will work, so he says it will work.
Look, for instance, at Grave Peril -- while they're surrounded by vampires and Michael is shouting that they can win the fight. At best they're in a position to go down swinging, but Michael believes he can win, so he says so -- he doesn't say, "On your feet, Harry, we have a 65.4% chance of winning this fight!"
To play devil's advocate: The White Council, (well, technically a sword rather than a gun). Or what do you think would happen to Molly if Harry took up the coin? Whether she stays with him or leaves, that's not going to be good for her.
In all seriousness, I think this is a fairly remote possibility--I'm more inclined to believe that Michael exaggerated rather than just lied.
As you say, it's at best remote; and I doubt Michael would be swayed, anyway.
If what Michael is saying is an exaggeration (which I have been calling a lie, but am realizing now that that's not a clear way to talk about it) then giving up his magic would help Harry. If Michael doesn't believe that Harry would give up his magic, then he doesn't need to factor the consequences of Harry doing so into the equation.
Given how well he knows Harry, I'd be inclined to believe Michael doesn't expect Harry to give up his magic (which is probably why Michael doesn't press the point much). I wouldn't call it an exaggeration, per se, but as I said, Michael tends to speak with conviction and sureness; he believes it will work, so he speaks as if it's a sure thing.
Michael acknowledged the possibility intellectually, and knew what his duty was. He didn't necessarily accept it emotionally. If he had, I would think he would have had a stronger emotional reaction to Harry turning down flat the only way he knows to get rid of the shadow. (Of course, he could have just gone home and dealt with his emotions where they wouldn't undermine Harry--we don't know).
He literally looks Harry in the eye and says that if Harry takes up the coin, he
absolutely will be there, and says so while his hand is on his sword. I don't know what more you could possibly want on this -- Michael makes it absolutely clear that he is fully prepared to take his best friend's head off if need be.
Ah. I understand the problem now. The disability is not the equivalent of Michael's idea not working. The equivalent to Michael's idea is my aunt's belief that I can get through college, and the possibility of it not working is why we discussed contingency plans.
On the other hand, thinking it over again, Michael probably would have expected Harry to contact him if he changed his mind about giving up his magic, so he might have saved discussing "what if it goes wrong" for then.
Michael definitely expects that, since he outright says if Harry decides to change his mind, Michael will be there for him.
I still don't think Michael is considering "what if it goes wrong," because, as I've said, I don't think he believes it
could go wrong, and we've seen no evidence it would.
Nicodemus not knowing that it is possible to get rid of a shadow is a data point. Here's why:
If there was a known method to get rid of a shadow, there is a good chance that Nicodemus would know it. As such, the chance of Nicodemus not knowing it is significantly less than 100%.
If there is no known method to get rid of a shadow, then the chance that Nicodemus did not know of one is 100%.
According to my understanding of formal logic, this works out to mean that Nicodemus not knowing the information means that it is more likely that there is no known way to get rid of a shadow than that there is one, based on the information given.
I kinda don't think formal logic comes into play; we're not talking about randomized statistical samples here. We're talking about people with biases and prejudices and motivations. Nicodemus is arrogant as hell, and after a couple hundred years of nobody to his knowledge removing a Shadow, he probably just thinks it's impossible and stops worrying, if he ever worried at all.
He's as vulnerable to confirmation bias as anyone, so if he doesn't want there to be a way to get rid of a Shadow, and in a couple hundred years, nobody does, that's good enough for him to conclude that it's simply a non-issue.
I think he does try to verify his information. How successful he is and when he is successful are different questions.
True. I won't posit that he can go to The Man Upstairs for confirmation on everything, but given what we see in the books, I'd suggest that his intuition and "gut feeling" is probably more accurate than most when he's trying to suss out the truth.
I don't mean that he should undermine what he has said. I mean that he could say "I'm 95% certain of this" rather than "I'm 100% certain of this."
That's just not how Michael works. If he's saying, "Do this and it will work," that indicates he's certain of it.
Explanations:
Why Michael would tell Harry to give up his magic if he were uncertain it would work, given the consequences:
I believe that if Michael thought that Harry would ever willingly give up his magic, then that implies that he didn't understand how important magic is to Harry and how much damage it would do for him to give it up. As such, either Michael did not expect Harry to give up his magic, in which case he wouldn't have any reason to consider the consequences if Harry did so; or Michael was missing information that would have told him how dire the consequences might be, and as such could not make an accurate assessment of the risks.
Fair on the first bit. On the second, again, I have to insist that Michael has no reason to be aware of these risks, and that the "missing information" didn't exist until it was posited in this thread. It's just not a reasonable concern he would have or should have had, and it's unfair to expect him to account for it.
On Michael exaggerating:
As I've said before, there is no evidence apart from Michael's word that Harry giving up his magic would destroy the shadow. There is, however, evidence that Harry giving up his magic would weaken the shadow's hold on him--the way hellfire ties into the shadow's influence. Hellfire is clearly a vector for the shadow to influence Harry. In the same book we see Harry using hellfire, we see the first negative effects the shadow has on Harry's mood. Further, the shadow can only interact with Harry's conscious mind once Harry has used hellfire consciously. Just as Mab prevented Harry from using fire magic because summer fire was entwined with it and would let Summer find him, Michael might believe that Harry needs to stop using magic in order to weaken/eliminate the shadow's influence on him, even if it doesn't destroy the shadow.
I agree with this in the sense that,
if there is no documented evidence of someone giving up their magic to weaken/get rid of a Shadow, this is almost certainly the chain of logic that led to the conclusion that getting rid of one's magic would get rid of a Shadow.